Subaru WRX & STI
Performance Parts

Start with an accessport tune, a quality downpipe (for turbo models), and an upgraded intercooler (Mishimoto or GrimmSpeed). These three mods together can add 40-60+ HP on the WRX platform. An intake is a great complement but should be tuned for at the same time.

Yes, absolutely. Running an aftermarket downpipe without a proper tune can cause engine knock and potential damage on the EJ and FA20 engines. A Cobb Accessport with an off-the-shelf map or a professional protune is required for safe operation.

The Borla S-Type and Injen SES offer the best balance of sound and performance for the BRZ/86 platform. Both bring out the character of the boxer engine without excessive drone. For maximum volume, the Tomei Expreme Ti is a lightweight titanium option loved by the community.

An intake is worth it on the WRX only when installed with a supporting tune; running one untuned can cause fueling issues on the FA20 and EJ engines. Properly tuned, an intake improves airflow, throttle response, and turbo sound as part of a larger power package. Prioritize a tune, downpipe, and intercooler first, then add the intake to complement them.

A downpipe combined with a proper tune typically adds 20-40 horsepower on the turbocharged WRX by dramatically improving exhaust flow off the turbo. It is one of the single most effective bolt-ons for the platform. Never run an aftermarket downpipe without a tune, as the change in flow can cause knock and potential engine damage.

Lowering springs from Eibach give a clean 1-1.5 inch drop and reduced body roll at a lower cost while keeping the factory struts, ideal for a street WRX. Coilovers offer adjustable ride height and damping for autocross and track use but cost more. Choose springs for looks and mild handling gains, coilovers for a dialed-in performance setup.

A cat-back exhaust adds only modest power on its own but delivers the aggressive boxer rumble Subaru owners love and reduces weight over the factory system. Borla and Injen SES systems balance tone and drone well. For real power gains, invest in a downpipe, intercooler, and tune first, then add the cat-back for sound and a lighter setup.