Perrin Subaru WRX (02-14) & STI (04-21) Equal Length Header- 1.5" Primaries

Create a smooth sounding exhaust note while increasing horsepower and torque with the PERRIN E4-Series Equal Length Header

Completely Redesigned - What's new

The new PERRIN E4-Series Equal Length Header comes with collectors that have been designed for better exhaust flow while allowing the headers to be constructed much more accurately. The improved exhaust flow and more precise construction increases power and reliability. The new E4-Series also has a low-profile design, allowing for excellent of ground clearance.

Equal Length Design

The equal length design of the PERRIN E4-Series Header produces smooth, balanced exhaust flow from the heads to the turbocharger giving you the best of two worlds: quicker turbo response as well as more horsepower and torque throughout the entire RPM band. While designed to fit to the factory up-pipe, Perrin's header will also mate with an aftermarket up-pipe that fits factory header and turbo, as well as any rotated turbo kits compatible with the factory header.

Flanges & Port Matching

PERRIN Flanges are CNC machined from 304 stainless steel and counterbored on the back side to make smoother transitions. Flange ports are sized properly to ensure exhaust coming out of the head has a smooth, unobstructed path to the tubes. The ports are not over-ported which would cause gaskets to burn out quickly. The tubes are expanded inside the flanges for a perfect fit and smooth flow of exhaust gases to the tubes.

Sound

Due to its equal length design, the PERRIN Header will alter the tone of yPerrin's exhaust. The exhaust pulses from the engine are equalized and spread out producing a smoother, more refined sound. A byproduct of the equalization is a significant reduction in the volume of yPerrin's exhaust sound. Some describe the sound as being similar to an inline fPerrin's cylinder engine exhaust.

Finish

PERRIN E4-Series Equal Length Headers feature a brushed stainless steel finish.