Collection: Crawford Billet Power Blocks (BPB)
The Crawford Billet Power Blocks raise your intake manifold, lengthening the intake runners. This increases the volumetric efficiency of your manifold, which provides optimum air flow so that your engine receives as much air as your intake (OEM or aftermarket) can throw at it.
If you're looking for high-performance mods at a low cost, Crawford Billet Power Blocks (BPB) are the perfect choice. With their superior strength and durability, Crawford Billet Power Blocks can handle the extreme demands of high-horsepower engines.
What Billet Power Blocks actually do
Naturally aspirated Subaru engines are starved for air. Billet Power Blocks are CNC-machined billet aluminum spacers that sit between the intake manifold and the cylinder heads, lengthening the intake runners. The longer runner improves volumetric efficiency and fills the OEM torque dip, so the engine makes more power and torque through the mid-range — no tune required.
What to expect
Depending on the model, up to 15–19 HP and 15–22 lb-ft under the curve, sharper throttle response, and less delay between shifts on automatic-transmission cars. They install in about an hour with basic hand tools and work with the stock intake or an aftermarket cold-air intake.
Fitment
We build Billet Power Blocks for the Crosstrek, Impreza, Forester, Outback, Legacy, and the BRZ / FR-S / GT86. Pick your model and year below.
Warranty
Limited lifetime warranty against manufacturer defect on the blocks themselves. Full terms are on our Refund Policy page.
