Upgrade Your Subaru WRX/STI's Exhaust System

Sold as a Cat-Back system, this Cat-Back is designed to fit to OEM downpipe location

• Mid Pipe Length: 50" Flange to Flange

• Axle-Back Length: 48" Flange to Tip 

Our exhaust was originally designed for Ken Block's Gymkhana 1 2006 Subaru STI.

This exhaust was designed for Ken Block and the Subaru Gymkhana Cars, but was originally inspired by the Crawford Performance Time Attack Race Car with one main reason behind this system: to be heard. Crawford Performance came up with an exhaust design that adds reverberation to the sound. The result is a doubling of the sound amplitude in effort to make the exhaust audible over the rest of the race track. It produces a loud, but deep sounding rumble, unlike anything on the market.

Made from 304 stainless steel, and hand fabricated in-house. 3 inch body to 4.5 inch tip.

Do you have a RHD Impreza? The down pipes are different lengths between the USDM and RHD models, so the mid pipe section of this cat-back will not connect with an OEM RHD downpipe. If you purchase the full turbo-back system that includes this cat-back and our USDM downpipe, it will then fit. 

Sound Clips

Crawford Air Oil Separator Complete Install Kits

For those of you who have purchased one of our Air/Oil Separators used, or just want to refresh your current kit, here are all of the pieces for re-installation. Pieces and prices will vary for each application.

Need help identifying which full kit part number is meant for your canister or vehicle?

Below are the full kits listed based on the canister type. If your vehicle is not listed with the canister, then that means that the canister you have is meant to be mounted on a different vehicle or location. That being said, you may be able to retrofit the unit to your engine bay: just be sure to mount the canister so that the ports are higher than their connection points. 

Do you have the wrong canister for your vehicle or do you need to mount it in a different location?

This only applies to the V2 cans (6 port), but you can cut off the bracket and purchase the Universal Kit (S0712-1). It comes with 3 different brackets to choose from along with a clamp for holding it to the canister. If you don't want the look of a clamp around your canister, you can take your bracket of choice to a fab shop to have it welded on.

• S0692: 19+ Forester 2.5, 21+ Crosstrek 2.5, 20+ Legacy 2.5, 20+ Outback 2.5

• S0696: 2018+ Subaru Crosstrek

• S0698: 2013-2017 Subaru Crosstrek, 2012-2016 Subaru Impreza, 2014-2016 Subaru Forester (Non-Turbo)

• S0699: 2008+ STI, 2008-2014 WRX, 07-13 FXT with Top Mount Intercooler

• S0711: 2013+ Subaru BRZ, 2013-2016 Scion FR-S, 2013+ Toyota GT86, 2017+ Toyota 86

 

• S0712-1: Universal

  

• S0714-1: 02-07 WRX, 02-07 STI, 04-06 Forester XT with Top Mount Intercooler

 

• S0715-1: 02-07 WRX, 02-07 STI, 04-06 Forester XT with Front Mount Intercooler

• S0717: 15+ WRX, 14-18 Forester XT with Top Mount Intercooler (DIT). Original S0717 now discontinued: Same canister as shown with an additional 2 ports at the bottom. Contact us for a custom kit if you have one of the old versions with 6 ports.

Use our Crawford Performance Stickers to spice up your fridge, toolbox, or car!

(Price includes Continental US shipping via USPS First Class)

Crawford Performance Air Oil Separator V3
STI  2008-2021 w/ TMIC

Crawford Performance Air Oil Separator: The Subaru Original

• Not a Catch Can - Closed Loop and Maintenance Free

• Consume Less Oil

• Extend the Life of your Engine

• Reduce Detonation and Risk of Engine / Ringland Failure

• Reduce Fuel Dilution and Subsequent Power Loss

New Dual Chamber (V3) Features:

• Our Latest technology - Not seen anywhere else and Patent Pending
• Double Labyrinth Chambers increase efficiency
• Does not delete Smog Component - Utilizes OEM PCV System
• Worldwide Compatibility: Fits on RHD Vehicles
• No Coolant Line = Easier Install

Oil pooling in your intake? Stop the oil from ever getting there with the Crawford Air Oil Separator.

The Crawford Performance Air Oil Separator (AOS) is the original solution to Subaru's notorious oiling system issues. Although the technology was pre-existing with other vehicle brands such as Porsche, Crawford Performance is the inventor of the first system specifically for Subaru. No other AOS on the market employs the same technology.

Want to know more about how an Air/Oil Separator works and why you need one? 

Click here to check out our FAQ blog on the technology inside. 
There you can also find a full fitment list for all current versions and kits.

Note: more V3 fitment options are currently in R&D. Is your car or application unavailable? Click here to check our V2 Kits, which have the widest range of fitments. 

*Note: Due to the fact that the AOS bracket connects to the TGV housing, this kit is not compatible with aftermarket TGV housings. 

*Note: This system was designed on USD models. Not compatible with all PCV systems across the world and may require some additional components to properly install.

Install Instructions

2008 - 2016 STI
     PDF
     Video

2017+ STI
     PDF
     Video

Dual Chamber (V3) for Subaru WRX: 2015 + w/ TMIC (Only fits with Top Mount Intercooler) 

Crawford Performance Air Oil Separator: 
The Subaru Original

• Not a Catch Can - Closed Loop and Maintenance Free

• Consume Less Oil

• Extend the Life of your Engine

• Reduce Detonation and Risk of Engine / Ringland Failure

• Reduce Fuel Dilution and Subsequent Power Loss

New Dual Chamber (V3) Features:

• Our Latest technology - Not seen anywhere else and Patent Pending
• Double Labyrinth Chambers increase efficiency
• Does not delete Smog Component - Utilizes OEM PCV System
• Worldwide Compatibility: Fits on RHD Vehicles
• No Coolant Line = Easier Install

Oil pooling in your intake? Stop the oil from ever getting there with the Crawford Air Oil Separator.

The Crawford Performance Air Oil Separator (AOS) is the original solution to Subaru's notorious oiling system issues. Although the technology was pre-existing with other vehicle brands such as Porsche, Crawford Performance is the inventor of the first system specifically for Subaru. No other AOS on the market employs the same technology.

Want to know more about how an Air/Oil Separator works and why you need one? 

Click here to check out our FAQ blog on the technology inside. 
There you can also find a full fitment list for all current versions and kits.

Note: more V3 fitment options are currently in R&D. Is your car or application unavailable? Click here to check our V2 Kits, which have the widest range of fitments. 

Install Instructions

This piece comes in the Air/Oil Separator Kits for EJ applications. Due to frequent requests for a replacement, we offer it separately. It is included in the following kits:

• S0712-1
• S0714-1
• S0715-1
• S0720
• S0720-1

Crawford Performance Air Oil Separator V2 - WRX 2002-2007

Crawford Performance Air Oil Separator: The Subaru Original

• Not a Catch Can - Closed Loop and Maintenance Free

• Consume Less Oil

• Extend the Life of your Engine

• Reduce Detonation and Risk of Engine / Ringland Failure

• Reduce Fuel Dilution and Subsequent Power Loss

Oil pooling in your intake? Stop the oil from ever getting there with the Crawford Air Oil Separator. 

The Crawford Performance Air Oil Separator (AOS) is the original solution to Subaru's notorious oiling system issues. Although the technology was pre-existing with other vehicle brands such as Porsche, Crawford Performance is the inventor of the first system specifically for Subaru. No other AOS on the market employs the same technology.

Notes: For Off-Road Use Only

Want to know more about how an Air/Oil Separator works and why you need one? 

Click here to check out our FAQ blog on the technology inside. 
There you can also find a full fitment list for all current versions and kits.

Also check out our latest technology with patent pending:
The Crawford Performance Dual Chamber AOS (V3)

This item is non-returnable at sale pricing.

Crawford Performance Hose for Air Oil Separator Kits - By the Inch and in Bulk

• Need a replacement hose for your AOS kit?

• Need a longer length to fit around an aftermarket part?

• Are you a shop looking to buy hose in bulk?

Sizes and Materials

SAE J30R7
Fuel line, Vapor Emission, and Crankcase Ventilation applications.

Sizes Available:

• 1/2" (12.7mm) ID
       Brand: Crawford Performance (Kink Free, High Grade, Heavy Duty)
       Part #: H0478

• 5/8" (15.9mm) ID
       Brand: Crawford Performance (Kink Free, High Grade, Heavy Duty)
       Part #: H0479

• 3/4" (19.05mm) ID
       Brand: Continental
       Part #: H0521

• 5/16" (7.9mm) ID
       Brand: Continental
       Part #: H0477

SAE J1042
Vacuum Line, PCV, Air Brake, and General Purpose Industrial applications.

Sizes Available:

• 3/8" (9.525mm) ID 
       Brand: Crawford Performance (Kink Free, High Grade, Heavy Duty)
       Part #: H0470

• 1/2" (12.7mm) ID
       Brand: Gates
       Part #: H0518

SAE 20R3 Class D-2
Coolant Line, High Heat, High Mileage Water and Cooling applications. No Oil. 

Sizes Available:

• 1/2" (12.7mm) ID
       Brand: Gates
       Part #: H0480

If you are interesting in bulk but we are out of stock, please contact us for an estimated timeframe for a custom order. 

Dual Chamber (V3) for Subaru WRX: 2008 - 2014 w/ TMIC (Only fits with Top Mount Intercooler) 

Crawford Performance Air Oil Separator: The Subaru Original

• Not a Catch Can - Closed Loop and Maintenance Free

• Consume Less Oil

• Extend the Life of your Engine

• Reduce Detonation and Risk of Engine / Ringland Failure

• Reduce Fuel Dilution and Subsequent Power Loss

New Dual Chamber (V3) Features:

• Our Latest technology - Not seen anywhere else and Patent Pending
• Double Labyrinth Chambers increase efficiency
• Does not delete Smog Component - Utilizes OEM PCV System
• Worldwide Compatibility: Fits on RHD Vehicles
• No Coolant Line = Easier Install

Oil pooling in your intake? Stop the oil from ever getting there with the Crawford Air Oil Separator.

The Crawford Performance Air Oil Separator (AOS) is the original solution to Subaru's notorious oiling system issues. Although the technology was pre-existing with other vehicle brands such as Porsche, Crawford Performance is the inventor of the first system specifically for Subaru. No other AOS on the market employs the same technology.

Want to know more about how an Air/Oil Separator works and why you need one? 

Click here to check out our FAQ blog on the technology inside. 
There you can also find a full fitment list for all current versions and kits.

Note: more V3 fitment options are currently in R&D. Is your car or application unavailable? Click here to check our V2 Kits, which have the widest range of fitments. 

*Note: Due to the fact that the AOS bracket connects to the TGV housing, this kit is not compatible with aftermarket TGV housings.

*Note: This system was designed on USD models. Not compatible with all PCV systems across the world and may require some additional components to properly install.

Install Instructions

Install Video
PDF

Crawford Performance Air Oil Separator V2 STI 2008-2014

Crawford Performance Air Oil Separator: The Subaru Original

• Not a Catch Can - Closed Loop and Maintenance Free

• Consume Less Oil

• Extend the Life of your Engine

• Reduce Detonation and Risk of Engine / Ringland Failure

• Reduce Fuel Dilution and Subsequent Power Loss

Oil pooling in your intake? Stop the oil from ever getting there with the Crawford Air Oil Separator.

The Crawford Performance Air Oil Separator (AOS) is the original solution to Subaru's notorious oiling system issues. Although the technology was pre-existing with other vehicle brands such as Porsche, Crawford Performance is the inventor of the first system specifically for Subaru. No other AOS on the market employs the same technology.

Note: For Off-Road Use Only

Want to know more about how an Air/Oil Separator works and why you need one? 

Click here to check out our FAQ blog on the technology inside. 
There you can also find a full fitment list for all current versions and kits.

Also check out our latest technology with patent pending:
The Crawford Performance Dual Chamber AOS (V3)

Crawford Legacy T-Shirt

Brand: Alstyle

Material: 100% Cotton

Fit: Adult Traditional

Subaru Manufacturer Part #: 10103AC480

*Please note OEM Motors have a 3-5 business day lead time before shipping. 

Bone Stock Brand New Genuine OEM fully assembled Short Block. You can safely make up to 400whp/480bhp on an OEM FA20 DIT short block with proper maintenance and a solid tune. 

This part is an ingredient to our recipe for a reliable Subaru Engine. If you purchase an OEM Block along with our CrawfordSPEC pistons or piston/long rod combo, you can assemble your own Crawford built short block that can handle up to 600whp! 
Want a pre-built block ready to go? Check out our options by clicking here.

After reading that, you may have had one of many questions or doubts pop in your mind because of all of the opinions floating around on the web along with misleading marketing. Like:
- Subaru engines are prone to fail from the factory
- You need a closed deck block to make high power
- My bearings failed, so I need aftermarket ones. Or: My head gaskets failed so I need aftermarket ones. 
The fact is, all of the above statements are not true. Click here to read our blog all about what our 23 years of testing Subaru's has proven.

New Subaru OEM EJ255 Short Block Engine
Part #10103AC880

*Please note OEM Motors have a 3-5 business day lead time before shipping. 

Bone Stock Brand New Genuine OEM fully assembled Short Block. Contrary to public opinion, you can safely make up to 400whp/480bhp on an OEM EJ25 short block with proper maintenance and a solid tune. 

This part is an ingredient to our recipe for a reliable Subaru Engine. If you purchase an OEM Block along with our CrawfordSPEC pistons or piston/long rod combo, you can assemble your own Crawford built short block that can handle up to 600whp! 

Want a pre-built block ready to go? Check out our options by clicking here.

After reading that, you may have had one of many questions or doubts pop in your mind because of all of the opinions floating around on the web along with misleading marketing. Like:
- Subaru engines are prone to fail from the factory
- You need a closed deck block to make high power with an EJ
- I can make 800whp safely with an EJ
- My bearings failed, so I need aftermarket ones. Or: My head gaskets failed so I need aftermarket ones. 
The fact is, all of the above statements are not true. Click here to read our blog all about what our 30 years of testing Subaru's has proven.

Subaru Short Block Installation Kit 2008-2021 EJ25

Short Block Installation Kit for:

• 2008-2014 Subaru Impreza WRX
• 2008-2021 Subaru Impreza WRX STi
• 2008-2012 Legacy GT
• 2008-2009 Outback XT
• 2008-2013 Forester XT

Everything we recommend replacing when rebuilding your EJ25 Engine

Through many years of trial and error, we have honed in on the essentials that are a MUST to replace when installing a new short block in your Subaru. Most of these items are genuine OEM Subaru parts, as these are the most reliable and proven parts that you can get. 

What's Included

• 1 set of Genuine OEM Head Gaskets
• 1 set of Genuine OEM Intake Manifold Gaskets
• 1 set of Genuine OEM Exhaust Manifold Gaskets
• 1 Genuine OEM Water Pump Gasket
• Genuine OEM Oil Pump 
• Genuine OEM Oil Pump Main Seal
• 11mm ARP Head Studs (12 per box)
• NGK One Step Colder Iridium Spark Plugs (LFR7AIX 2309)
• K&N Oil Filter
• 5 Quarts of Motul Break-In Oil (we recommend running this for at least 1000 miles)

Crawford Performance Air Oil Separator V2 -Universal

Crawford Performance Air Oil Separator: The Subaru Original

• Not a Catch Can - Closed Loop and Maintenance Free

• Consume Less Oil

• Extend the Life of your Engine

• Reduce Detonation and Risk of Engine / Ringland Failure

• Reduce Fuel Dilution and Subsequent Power Loss

*Note: This is a universal cannister for Turbo applications

Oil pooling in your intake? Stop the oil from ever getting there with the Crawford Air Oil Separator.

The Crawford Performance Air Oil Separator (AOS) is the original solution to Subaru's notobrious oiling system issues. Although the technology was pre-existing with other vehicle brands such as Porsche, Crawford Performance is the inventor of the first system specifically for Subaru. No other AOS on the market employs the same technology.

Want to know more about how an Air/Oil Separator works and why you need one? Click here to check out our FAQ blog on the technology inside. 
There you can also find a full fitment list for all current versions and kits.

Note: For Off-Road Use Only

Check out our latest technology with patent pending:
The Crawford Performance Dual Chamber AOS (V3)

Crawford Performance T-Shirt: Off-Road / Street / Track w/ Crawford Built Off-Road Crosstrek & Tony the Tiger

Colors: Black or Blue

Crawford Performance Air Oil Separator V2 - Forester XT 2004-2006

Crawford Performance Air Oil Separator: The Subaru Original

• Not a Catch Can - Closed Loop and Maintenance Free

• Consume Less Oil

• Extend the Life of your Engine

• Reduce Detonation and Risk of Engine / Ringland Failure

• Reduce Fuel Dilution and Subsequent Power Loss

Oil pooling in your intake? Stop the oil from ever getting there with the Crawford Air Oil Separator.

The Crawford Performance Air Oil Separator (AOS) is the original solution to Subaru's notorious oiling system issues. Although the technology was pre-existing with other vehicle brands such as Porsche, Crawford Performance is the inventor of the first system specifically for Subaru. No other AOS on the market employs the same technology.

Note: For Off-Road Use Only

Want to know more about how an Air/Oil Separator works and why you need one? 

Click here to check out our FAQ blog on the technology inside. 
There you can also find a full fitment list for all current versions and kits.

Also check out our latest technology with patent pending:
The Crawford Performance Dual Chamber AOS (V3)

100% synthetic engine oil designed for modern cars with high power to liter ratio, with gasoline or diesel engines, direct injection or catalytic converter. Will improve power and responsiveness. Reinforced anti-wear protection for a longer life of engine parts.

Recommended for your daily driver.

MOTUL Mfg. Part #: 109776

New Subaru OEM EJ257 Short Block Engine
Part #10103AC870 

Bone Stock Brand New Genuine OEM fully assembled Short Block. Contrary to public opinion, you can safely make up to 400whp/480bhp on an OEM EJ25 short block with proper maintenance and a solid tune. 

This part is an ingredient to our recipe for a reliable Subaru Engine. If you purchase an OEM Block along with our CrawfordSPEC pistons or piston/long rod combo, you can assemble your own Crawford built short block that can handle up to 600whp! 

Want a pre-built block ready to go? Check out our options by clicking here.

After reading that, you may have had one of many questions or doubts pop in your mind because of all of the opinions floating around on the web along with misleading marketing.

Like:
- Subaru engines are prone to fail from the factory
- You need a closed deck block to make high power with an EJ
- I can make 800whp safely with an EJ
- My bearings failed, so I need aftermarket ones. Or: My head gaskets failed so I need aftermarket ones. 

The fact is, all of the above statements are not true. Click here to read our blog all about what our nearly 30 years of testing Subaru's has proven.

Get Better Performance and Sound with Crawford Performance Gymkhana SideKick Cat-Back Exhaust

The most raw and pure soundtrack for your Subaru.

• Megaphone Tip Amplifies and Deepens the Subie Rumble

• WRX / STI Exhaust is Constructed from Stainless Steel for Strength and Durability

• Fits OEM WRX /STI Downpipe

• Lightweight Design

Inspired by our original exhaust designed for Ken Block's Gymkhana Two: The Infomercial; the GK2 carries the torch into the newer STI/WRX models.
Stand out with the unique look and sound of the Gymkhana Megaphone tips.

Made in the USA from 304 Stainless.

*Please note this Cat-Back Exhaust System is made to fit up to OEM downpipe location. 

If you're looking to upgrade your Subaru WRX STI with better performance and sound, then Crawford Performance Gymkhana SideKick Cat-Back Exhaust is the perfect fit for you. Designed specifically for 2015-2021 Subaru WRX STI, this cat-back exhaust is engineered to improve the overall performance of your car while enhancing the sound.

The Gymkhana SideKick Cat-Back Exhaust is made with premium quality materials to ensure durability and longevity. The exhaust system features a high-flow design that increases the flow rate of exhaust gases, resulting in improved horsepower, torque, and overall performance. The muffler is also designed to reduce backpressure, which improves the efficiency and speed of your vehicle.

Another great feature of the Crawford Performance Gymkhana SideKick Cat-Back Exhaust is the sound it produces. The unique design of the exhaust system creates an aggressive and sporty exhaust note that will turn heads wherever you go. This exhaust also features a polished finish for added style.

In addition to the performance and sound improvements, the Gymkhana SideKick Cat-Back Exhaust is also easy to install. The exhaust system comes with all the necessary hardware and instructions for a hassle-free installation process. You can have your new exhaust system installed in no time.

Upgrade your Subaru WRX STI with the Crawford Performance Gymkhana SideKick Cat-Back Exhaust and experience the difference in performance and sound. Buy now for best offers and enjoy the benefits of this high-quality exhaust system.