5 Best Subaru Aftermarket Exhausts for Power

Swapping out your factory exhaust is a rite of passage for most Subaru owners. It’s often the very first modification, and for good reason—it delivers an immediate and satisfying change you can both hear and feel. The stock system is designed for quiet efficiency, but it leaves so much character on the table. A high-quality Subaru aftermarket exhaust is the key to unlocking the iconic boxer rumble, improving throttle response, and giving your car a personality that matches your own. This guide will walk you through everything you need to know, from the different types of systems to the best brands for your specific model.

Key Takeaways

• Prioritize Your Performance Goals: Decide if you're primarily seeking a more aggressive sound or a tangible increase in horsepower. An axle-back system is perfect for sound and style, while a cat-back or turbo-back is required to significantly improve engine performance.
• A Tune Activates Your Power Gains: For turbocharged models like the WRX and STI, a professional tune is non-negotiable after installing a high-flow exhaust. It ensures your engine runs safely and is the key to converting better airflow into real horsepower and torque.
• Focus on Quality and Compatibility: A successful upgrade depends on the details. Confirm the system is made for your exact model and year to guarantee a perfect fit, and check local noise laws before installation to avoid any future issues.

Why Upgrade Your Subaru's Exhaust?

Swapping out your stock exhaust is one of the most popular first mods for any Subaru owner, and for good reason. It’s a modification that delivers immediate, noticeable results you can both feel and hear. A high-quality aftermarket exhaust system does more than just change your car’s sound—it unlocks tangible performance gains, enhances your vehicle’s appearance, and gives your Subaru a personality that matches your own.

Whether you drive a track-ready WRX or STI or an adventure-bound Crosstrek, the right exhaust system is a foundational upgrade. It improves the engine's ability to breathe by allowing exhaust gases to exit more efficiently. This simple change can transform your daily drive and set the stage for future modifications. Let’s break down the three key benefits you can expect from upgrading your Subaru’s exhaust.

Feel a Real Performance Gain

The primary function of a performance exhaust is to reduce backpressure. Your stock system is designed to be quiet and cost-effective, which often means it’s restrictive. By creating a more direct path for exhaust gases to escape, an aftermarket system allows your engine to work more efficiently. This improved flow translates directly into more power.

You’ll feel a noticeable increase in horsepower and torque, along with a sharper throttle response. The engine won’t have to work as hard to push out gases, freeing up power that you can feel every time you press the accelerator. This is why so many enthusiasts start here—it’s a straightforward way to get more out of your engine without complex internal modifications. Upgrading is a key step in building a comprehensive performance parts package for your vehicle.

Get That Head-Turning Sound

Let’s be honest: the sound is a huge part of the appeal. The iconic Subaru rumble is a signature trait, and an aftermarket exhaust lets you fine-tune it to your exact preference. Stock systems are built to muffle engine noise, but a performance exhaust is engineered to create a specific acoustic profile. You can choose anything from a deep, refined tone that’s slightly more aggressive than stock to a loud, assertive roar that announces your arrival.

This isn’t just about being loud; it’s about achieving the right sound. Different systems use unique muffler designs and pipe diameters to shape the exhaust note. For many owners of a Subaru WRX, dialing in that perfect, aggressive boxer rumble is a rite of passage that makes every drive more engaging and fun.

Improve Looks and Reduce Weight

Beyond sound and power, an exhaust upgrade offers a significant visual enhancement. Factory exhaust tips are often small and plain, but aftermarket systems typically feature larger, polished tips made from high-quality stainless steel or even titanium. This small detail can completely change the look of your car’s rear end, giving it a more purposeful and high-performance appearance.

Furthermore, performance exhausts are often lighter than their stock counterparts. Manufacturers use advanced materials and designs to shed pounds, and reducing your vehicle’s overall weight improves everything from handling and acceleration to braking. For those building overlanding solutions, every pound saved matters. A lighter, more durable exhaust system is a smart upgrade that adds style and function in one package.

What Are the Different Types of Subaru Exhausts?

When you decide to upgrade your exhaust, you’re not just swapping out one part. You’re choosing a section of a complex system to replace. Each type of exhaust upgrade offers a different balance of sound, performance, and price, so understanding the terminology is the first step toward picking the right setup for your car. Whether you’re looking for a deeper rumble for your daily driver or aiming to maximize horsepower on the track, there’s a specific type of exhaust system designed to meet your goals. From a simple axle-back that changes your car's voice to a full turbo-back system that transforms its performance, let's break down what each option involves. This will help you make an informed choice for your specific Subaru WRX upgrades or modifications for any other model.

Axle-Back: The Entry-Level Upgrade

If you’re looking for a quick, affordable way to change your Subaru’s sound and appearance, an axle-back exhaust is the perfect starting point. This system replaces only the final section of your exhaust, from the rear axle to the exhaust tips. Because it’s just the muffler and tips, installation is straightforward and can often be done in your own garage. While an axle-back system delivers that aggressive, sporty tone many drivers want, it offers minimal performance gains since it doesn't address the more restrictive parts of the exhaust. Think of it as a great first mod for sound and style without a major investment.

Cat-Back: The Popular All-Rounder

A cat-back exhaust is one of the most popular upgrades for a reason. It strikes an excellent balance between performance, sound, and cost. This system replaces all the components from the catalytic converter to the exhaust tips, including the mid-pipe and muffler. By using larger diameter piping and a high-flow muffler, a cat-back system reduces backpressure and allows exhaust gases to escape more freely. The result is a noticeable improvement in horsepower and torque, along with a much more aggressive sound than an axle-back can provide. It’s a fantastic all-around choice for enthusiasts who want a tangible performance increase for their Subaru STI or Forester.

Turbo-Back: The Ultimate Performance Mod

For those seeking the largest possible power gains, a turbo-back exhaust is the answer. This system replaces everything from the turbocharger to the exhaust tips, including the downpipe, mid-pipe, and muffler. By creating a wide-open path for exhaust gases, a turbo-back system dramatically reduces restrictions and allows your turbo to spool faster and more efficiently. However, this significant change in airflow requires a professional engine tuning service to recalibrate your ECU. Skipping this step can lead to serious engine damage, so always factor a tune into your budget when considering a turbo-back system. It’s the go-to option for serious track builds and high-horsepower street cars.

Headers & Downpipes: Unleash Your Turbo

Headers and downpipes are the components that have the most direct impact on your engine’s ability to breathe. The downpipe, which connects the turbocharger to the rest of the exhaust, is often the most restrictive part of a factory turbo Subaru system. Upgrading to a high-flow downpipe is one of the most effective ways to unlock power. Similarly, performance headers on non-turbo models streamline exhaust flow directly from the engine. These performance parts deliver a deeper, more aggressive sound, quicker throttle response, and a significant increase in horsepower and torque. They are essential components for anyone serious about maximizing their Subaru’s performance potential.

Explore Crawford Performance Exhausts

At Crawford Performance, we don’t just sell parts; we engineer solutions based on decades of Subaru tuning and racing experience. Our exhaust systems are designed in-house to meet specific performance goals, whether you're aiming for a podium finish or equipping your rig for a backcountry adventure. We build our exhausts to deliver a signature sound, measurable power gains, and the durability to handle whatever you throw at them. Each system is a direct result of our hands-on approach to getting the most out of every Subaru platform.

Custom Systems for WRX and STI

For WRX and STI drivers, the exhaust is a core part of the car's personality. You want an aggressive tone that announces your presence and an increase in power you can actually feel. Our custom exhaust systems, like the popular Gymkhana series, are engineered to deliver exactly that. We focus on creating a deep, powerful rumble without the harsh, tinny sound you get from lower-quality systems. More importantly, our designs prioritize perfect fitment. You can expect a straightforward, bolt-on installation with no cutting or welding required, getting you back on the road faster. Explore our full line of Subaru WRX upgrades to find the right setup for your build.

Overland-Ready Options for Crosstrek and Forester

An exhaust upgrade for your Crosstrek or Forester shouldn't mean you have to live with a deafening drone on long highway drives. Our overlanding solutions are designed for adventurers who need reliable performance and a refined sound. We engineer these systems to produce a deeper, more satisfying exhaust note that enhances the driving experience without being intrusive inside the cabin. This balance makes them perfect for daily commuting during the week and hitting rugged trails on the weekend. You get the performance benefits and improved sound without sacrificing comfort on your journey.

Track-Proven Performance with a 12-Month Warranty

Pushing your Subaru to its limits requires parts you can trust. We develop and test our performance parts in the most demanding environments, from professional rally stages to intense track days. This commitment to quality is why we stand behind our exhaust systems with a 12-month warranty. We build them not just for peak power but for long-term durability and reliability. This gives you the confidence to invest in an upgrade that will perform consistently, whether you're setting a new personal best on the track or navigating your daily commute.

What Are the Best Subaru Exhaust Brands?

When you start shopping for an exhaust, you'll quickly notice a few names that pop up again and again. The Subaru aftermarket is full of incredible engineering, and several brands have built a solid reputation for quality, performance, and sound. While we design and build our own track-tested systems right here at Crawford Performance, it’s helpful to know the landscape. Understanding what makes each brand unique will help you make a more informed decision for your build, whether you're aiming for a specific sound or maximum power gains.

Each of these brands brings something different to the table. Some focus on creating a signature exhaust note, others prioritize raw performance gains, and a few aim to create an integrated system that works perfectly with other modifications. Let's break down five of the most popular and respected exhaust manufacturers in the Subaru community.

Borla: Engineered for Sound

Borla is a giant in the exhaust world, and for good reason. They are masters of sound engineering, creating systems that produce a deep, aggressive rumble without the annoying drone on the highway. They offer a huge variety of systems for nearly every modern Subaru, from the WRX and STI to the Crosstrek and Forester. You can find everything from a simple Axle-Back to a full Cat-Back system, giving you options at different price points. If your main goal is to get that classic Subaru boxer rumble and a high-quality, durable exhaust, Borla is a fantastic choice.

Invidia: Designed for Performance

If you’ve been to a Subaru meet, you’ve definitely heard an Invidia exhaust. This brand is incredibly popular among enthusiasts, especially in the WRX and STI communities. Invidia focuses on creating high-flow systems that reduce backpressure and help your turbo breathe easier, leading to real horsepower and torque gains. Their N1 and Q300 models are legendary, offering different sound levels to match your personal preference. For drivers looking to get a noticeable bump in power and a classic aftermarket sound, Invidia’s performance parts are a go-to option.

COBB Tuning: The Integrated Approach

COBB Tuning is known for its holistic approach to vehicle modification. Their exhaust systems are engineered not just as standalone parts, but as key components of a complete performance package. They are designed to work seamlessly with the COBB Accessport, intakes, and other upgrades, ensuring everything functions in harmony. This makes them an excellent choice for owners who plan on doing multiple modifications and want a proven, reliable path to more power. Their systems often have a refined, OEM+ look and a mature sound that isn't overly loud, which is perfect for a daily driver.

HKS: Proven on the Racetrack

With a rich history in Japanese motorsport, HKS brings decades of racing experience to its products. Their exhaust systems are built with one primary goal: maximum performance. Known for their high-quality materials and precision welds, HKS exhausts are designed to handle the abuse of track days and aggressive driving. They often feature a distinct, high-pitched, and aggressive tone that stands out from the crowd. If you’re building a car inspired by JDM racing culture or want parts that have been proven in competitive environments, HKS is a brand that delivers on its performance promises for Subaru WRX upgrades.

Nameless Performance: Tailor Your Sound

Nameless Performance has carved out a niche by offering a high degree of customization. They understand that "loud" is subjective, so they provide multiple options to help you find the perfect sound level. You can choose from different muffler designs—or go with a muffler delete for the most aggressive sound possible. This flexibility makes them a popular choice for owners who want to fine-tune their car's personality. Whether you want a subtle, deep tone for your daily commute or a loud, crackling setup for your Subaru STI, Nameless likely has a configuration that fits your exact needs.

How Much Does a Quality Subaru Exhaust Cost?

Upgrading your exhaust is one of the most rewarding modifications you can make, but prices can vary quite a bit. The cost depends on several factors: the type of system (axle-back vs. cat-back), the material (stainless steel vs. titanium), and the brand's reputation. Generally, you get what you pay for in terms of build quality, sound engineering, and performance gains. A well-made exhaust from a reputable manufacturer will fit better, last longer, and provide a more refined sound than a generic, mass-produced alternative.

To give you a clear idea of what to budget, we can break down the market into three main tiers. Whether you're looking for a simple sound upgrade or a full system to maximize your engine's potential, there's an option that fits your goals and your wallet. Remember to factor in the potential cost of professional installation if you're not planning to do it yourself. Exploring different performance parts can help you find the perfect balance between price and power for your specific Subaru model.

Budget-Friendly: $463–$800

If you're looking for an affordable way to get that signature Subaru rumble without a huge investment, the budget-friendly tier is a great place to start. In this price range, you'll mostly find axle-back exhaust systems. These replace the final section of your exhaust, including the muffler, and are perfect for enhancing sound and aesthetics. While they don't offer the same performance gains as a full cat-back system, they provide a noticeable improvement over the stock setup. For example, you can find a quality Subaru axle-back system starting around $463, making it an accessible entry point into exhaust modification.

Mid-Range: $800–$1,200

This is the sweet spot for many Subaru owners. The mid-range tier offers an excellent balance of performance, sound, and quality. Here, you'll find a wide selection of cat-back exhaust systems from well-respected brands. These systems replace everything from the catalytic converter back, offering better exhaust flow, a more aggressive tone, and a tangible increase in horsepower and torque. You can find many highly-rated exhausts for Subaru models like the WRX, STI, and Forester in this price bracket, often with multiple tip and muffler options to customize your car's look and sound.

Premium Tier: $1,200+

For those who want the absolute best in performance and craftsmanship, the premium tier is where you'll find it. These systems often feature high-end materials like titanium, which significantly reduces weight, or they are full turbo-back systems designed for maximum power output. Brands in this category invest heavily in research and development to create exhausts with precisely engineered sound and optimal flow dynamics. Prices can climb upwards of $2,100 for specialized Subaru offroad exhausts or track-focused setups, delivering top-tier performance for serious enthusiasts who demand the best for their build.

How to Find the Best Deals

Getting a great price on your new exhaust doesn't have to be difficult. A little research can go a long way. Start by shopping around during major holiday sales events like Black Friday or Cyber Monday, as many retailers offer significant discounts. It's also a good idea to look for retailers that offer price matching. For instance, some suppliers have a 110% Price Match Guarantee, ensuring you get the lowest price available. Finally, consider buying from a brand that offers a comprehensive warranty, which adds long-term value and peace of mind to your purchase.

How to Choose the Right Exhaust for Your Subaru

Choosing the right exhaust isn't a one-size-fits-all decision. The best system for your Subaru depends entirely on your model and what you want to achieve. A track-ready STI has vastly different needs than a Crosstrek built for overlanding or an Impreza used for daily commuting. Understanding these differences is the first step to finding an exhaust that delivers the sound, performance, and reliability you expect. Let's break down the ideal choices for your specific driving style.

For the WRX and STI Driver

If you drive a WRX or STI, you’re likely focused on one thing: performance. To get the most out of your turbocharged engine, a full turbo-back exhaust is the ultimate upgrade. However, this modification requires a professional tune. Installing a turbo-back system without one can lead to serious engine damage because the engine isn't calibrated for the massive increase in airflow. A proper engine tune ensures your ECU can manage the new power safely, protecting your investment while you enjoy the significant horsepower and torque gains. This path is for the serious enthusiast ready to transform their car's performance.

For the Crosstrek and Forester Adventurer

For Crosstrek and Forester owners, the goal is often to add a more aggressive sound and a bit of character for daily driving and trail adventures. A cat-back exhaust system is the perfect solution. Since these systems replace components downstream of the catalytic converter, they typically won't void your Subaru warranty. This allows you to get that satisfying exhaust note and a modest performance improvement without compromising reliability or facing issues with your dealership. It’s a smart, effective upgrade that enhances your driving experience, whether you're on the highway or exploring new overlanding solutions.

For the Impreza and BRZ Daily Driver

When you’re driving a naturally aspirated Impreza or BRZ, an exhaust upgrade is more about refining the driving experience than chasing huge power numbers. The key is finding a system that’s compatible with your specific model to ensure you get a great sound without creating drone or losing low-end torque. An axle-back or cat-back system can give your car a sportier, more engaging tone and improve throttle response. When looking at Impreza upgrades, focus on quality construction and a sound profile that fits your daily driving needs. This approach guarantees you’ll get the performance feel you want while maintaining your car’s reliability.

Do You Need a Tune After an Exhaust Install?

This is one of the most common questions we get, and the answer is crucial for your Subaru’s health and performance. While a simple axle-back exhaust might not require one, any significant change to your exhaust system—especially on a turbocharged model like a WRX or STI—makes a tune a necessity, not an option. Think of it this way: your new exhaust lets your engine breathe out more freely. A tune adjusts your engine’s computer (ECU) to account for this change, optimizing fuel delivery and ignition timing to match the new airflow.

Without a proper tune, you’re not only leaving power on the table, but you could also be putting your engine at risk. The factory ECU is calibrated for factory parts. When you install a high-flow exhaust, you change the entire equation of how air moves through your engine. The ECU might try to compensate, but it's working with incomplete information, which can lead to dangerous conditions. A professional tune ensures your engine runs safely and efficiently, giving you the power gains you paid for while protecting your investment. It’s the final step that brings all your modifications together into a cohesive, reliable package.

When Is a Tune Required?

Whether you need a tune depends entirely on which part of the exhaust you’ve replaced. For an axle-back system, which only changes the muffler and tips, a tune is generally not required. The change in airflow is minimal, and the primary benefit is improved sound.

However, once you install a cat-back system, a tune becomes highly recommended. While your stock ECU can often compensate, it won't be optimized for the increased flow, meaning you won't see the full performance benefit. For a full turbo-back exhaust, which includes a new downpipe, a tune is absolutely essential for engine safety. Installing a high-flow downpipe without a professional tune is a major risk that can lead to engine damage. It drastically changes backpressure, which can cause your engine to run lean, spike boost, and potentially lead to catastrophic failure.

The Benefits of a Professional Tune

A professional tune does more than just prevent engine damage; it’s what truly unlocks the potential of your new exhaust system. The main benefit is maximizing performance. A tuner will adjust your ECU’s maps to take full advantage of the improved exhaust flow, resulting in significant gains in horsepower and torque, along with better throttle response. Your car won’t just be louder—it will be noticeably faster and more responsive.

Beyond raw power, our expert engine tuning services ensure all your components work together in harmony. Optimizing your Subaru's performance exhaust system involves considering the compatibility of all your chosen components with your specific model. A tune smooths out the power curve, improves drivability, and can even increase fuel efficiency under normal driving conditions. It transforms your collection of high-quality performance parts into a single, optimized system built for power and reliability.

What to Know Before You Install

You’ve done the research and have your heart set on the perfect exhaust system. Before you click “buy” or get under the car, there are a few final details to sort out. Taking a moment to consider these points will save you from headaches like failed inspections, annoying rattles, or parts that don't fit. A successful installation is all about preparation, so let’s walk through the final checklist to ensure your upgrade goes smoothly and you get the results you’re looking for.

Choose the Right Material

The material of your exhaust system affects its lifespan, weight, and cost. Most aftermarket exhausts are made from stainless steel, but not all stainless is created equal. T304 stainless steel is the premium choice, offering top-tier corrosion resistance that keeps it looking great for years. A more budget-friendly option is T409 stainless, which is still very durable but may develop surface rust over time. For those seeking the ultimate in performance, titanium is the way to go. It’s incredibly lightweight, which helps reduce your car’s overall weight, and it produces a distinct, exotic exhaust note. Your choice depends on your budget and how you plan to use your Subaru.

Ensure Proper Fitment

Nothing is more frustrating than discovering your new exhaust doesn’t line up correctly. Always double-check that the system you’re buying is designed for your Subaru’s specific year, model, and trim. For example, an exhaust for a WRX sedan won’t fit a hatchback from the same generation. Reputable manufacturers provide detailed fitment information, so read it carefully. A perfect fit ensures there are no exhaust leaks, rattles, or clearance issues with other components under your car. When you shop for quality performance parts, you can be confident that they are engineered for your specific vehicle.

Check Local Noise Laws

An exhaust ticket can ruin the thrill of your new upgrade. Before installing, take a few minutes to research your state and local laws regarding exhaust noise and emissions. Many areas have specific decibel limits, and a loud exhaust can attract unwanted attention from law enforcement. Some components, especially those that remove catalytic converters, are designated for "off-road use only" and are not legal for street driving. A quick search for your local regulations will help you choose a system that delivers the sound you want without getting you into trouble. This simple step ensures you can enjoy your Subaru’s new voice worry-free.

DIY vs. Professional Installation

Are you going to install this yourself or hand it over to a pro? If you’re comfortable with a wrench and have the right tools (like jack stands, a socket set, and penetrating oil for stubborn bolts), a DIY installation can be a satisfying project. However, if you’re short on time, tools, or experience, professional installation is the best choice. A skilled technician will ensure everything is mounted securely, torqued to spec, and free of leaks. This is especially important for turbo-back systems that require careful work around the engine. Pairing your install with professional engine tuning services is the best way to guarantee optimal performance and reliability from your new setup.

Common Subaru Exhaust Myths, Busted

When you start exploring aftermarket parts, you’ll quickly find that opinions are everywhere. It can be tough to separate fact from fiction, especially when it comes to exhaust systems. Let’s clear the air and tackle some of the most common myths you’ll hear about upgrading your Subaru’s exhaust so you can make your decision with confidence.

Myth: You Need Backpressure

This is one of the most persistent myths, especially in turbocharged communities. The idea is that an engine needs a certain amount of backpressure from the exhaust to perform correctly. For a naturally aspirated engine, there’s a tiny grain of truth related to exhaust scavenging at low RPMs. But for a turbocharged Subaru like a WRX or STI, the opposite is true. A turbo works by using exhaust gas to spin a turbine. The faster you can get those gases out of the engine and through the turbo, the more efficiently it works. Reducing backpressure allows the turbo to spool quicker and generate more power. The real key is a well-engineered system that manages flow, not one that creates a bottleneck.

Myth: It Voids Your Warranty

The fear of voiding a factory warranty stops many owners from modifying their cars. Here’s the good news: simply installing an aftermarket exhaust does not automatically void your entire vehicle warranty. Thanks to consumer protection laws like the Magnuson-Moss Warranty Act, a manufacturer has to prove that your specific modification directly caused the failure you’re claiming under warranty. For example, installing a cat-back exhaust system is highly unlikely to cause an issue with your radio. Choosing high-quality performance parts from a reputable manufacturer also ensures better fitment and reliability, further reducing any potential risks.

Myth: Louder Means Faster

It’s easy to associate a roaring exhaust note with raw power, but volume isn’t a reliable measure of performance. A loud exhaust simply means it’s not muffling sound as much—it doesn’t guarantee that it’s designed for optimal airflow. In fact, a poorly designed system can be loud and actually reduce horsepower by creating turbulence. True performance gains come from an exhaust that is engineered to improve flow dynamics, reduce weight, and work in harmony with your engine. The aggressive sound is often a fantastic bonus, but the real magic is in the improved efficiency you get from expert engine tuning services paired with a quality exhaust.

Related Articles

• High-Performance Subaru Rally Exhaust: A Buyer's Guide
• Is a High Performance Exhaust System Worth It?
• How to Choose a High Performance Exhaust System

Frequently Asked Questions

What's the main difference in results between an axle-back and a cat-back system? The primary difference comes down to sound versus comprehensive performance. An axle-back system is mainly a sound and style upgrade, replacing just the muffler to give your car a more aggressive tone. A cat-back system, on the other hand, replaces more of the piping, which reduces restrictions and delivers a noticeable increase in horsepower and torque in addition to a more powerful sound.

Do I really need a tune if I only install a cat-back exhaust? While a tune isn't strictly mandatory for a cat-back system like it is for a turbo-back, it's highly recommended. Your car will run safely without one, but you'll be leaving performance on the table. A professional tune adjusts your engine's computer to take full advantage of the improved airflow, ensuring you get the horsepower and torque gains you paid for and a smoother power delivery.

Will an aftermarket exhaust void my Subaru's warranty? Installing an aftermarket exhaust does not automatically void your entire vehicle warranty. Legally, a manufacturer must prove that your specific modification directly caused the part failure you're claiming. A well-made cat-back system is very unlikely to cause an engine or electrical issue. Choosing quality parts from a reputable brand further minimizes any potential risk.

Are exhaust upgrades worth it for a non-turbo Subaru like an Impreza or Crosstrek? Absolutely. While you won't see the dramatic horsepower jumps that turbocharged models get, an exhaust upgrade on a non-turbo Subaru still provides real benefits. You'll get a much more engaging and sporty sound, improved throttle response, and a modest power increase. It's one of the best ways to make your daily drive more enjoyable and give your car more personality.

How difficult is it to install an exhaust myself? The difficulty depends on the type of system and your mechanical comfort level. An axle-back is a relatively simple project that many people can handle in their driveway with basic tools. A cat-back or turbo-back system is more involved and may require dealing with rusty bolts and tight spaces. If you're not confident working under your car, a professional installation is a worthwhile investment to ensure everything is fitted perfectly and free of leaks.