Perrin Equal Length Header WRX (2015-2018) Wheels tapering to 3" and bolting

tapering to 3" and bolting into a 3" race pipe

- Improved throttle response and acceleration

but with a 15-20% higher torque capacity

The AWE Tuning MK7 Performance Downpipe is designed to mate to an AWE Tuning® Exhaust or any other exhaust that bolts to factory locations

In effect caster is the angle on which the steering knuckle rotates

Perrin Equal Length Header WRX (2015-2018) Wheels tapering to 3" and boltingIncrease power and torque through quicker turbo response and a more efficient collector design with the PERRIN Equal Length Header for the 2015 2017 WRX. Instantly increase turbo response and add 15 20 wheel horsepower and 20 ft lbs of torque with the PERRIN Equal Length Headers. This part is perfectly safe to install and does not required an ECU tune. Dyno graph shows results of a 2015 WRX with typical bolt ons (3 inch turbo back exhaust and no ECU