Increase power and torque through quicker turbo response and a more efficient collector design with the PERRIN Equal Length Header for 2015-2021 WRX.
Instantly increase turbo response and add 15-20 wheel horsepower and 20 ft-lbs of torque with the Perrin Equal Lenght Headers. This part is perfectly safe to install and does not require an ECU tune. Dyno graph shows results of a 2015 WRX with typical bolt-ons(3 inch turbo-back exhaust and NO tune between dyno runs) where the Perrin headers was the only part changed. Results may vary on 91 octane gas.