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 exhaut flow and more precise construction increases power and reliability. The new E4-Series 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, our 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.
Perfectly Sized for More Horsepower
You won't see grossly over-sized tubing to make our header "look" impressive, this just slows exhaust gas flow and reducs response. The Perrin header uses 1.625" primary tubing that is expanded at the flange to fit the Subaru exhaust port size. The tubing sizes are perfectly designed for cars above 400 wheel horsepower.
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 fro a perfect fit and smooth flow of exhaust gases to the tubes.
Due to its equal length design, the Perrin Header will alter the tone of your 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 your exhaust sound. some describe the sound as being similar to an inline four cylinder engine exhaust.
- 2002-2014 WRX
- 2004+ STI
- 2004-2013 Forester XT
- 2005-2007 Legacy GT
- 2005-2007 Outback XT
2002-2005 WRX: requires oil pan with header cutout and oil pickup tube, and custom modification to the radiator line to the transmission.
2002-2005 WRX: Automatic Transmission Yes, requires modifications to radiator.
2006-2007 WRX: requires 2002-04 WRX oil cooler assembly and oil feed pipe.
2004-2008 Forester XT - Yes, requires oil pan with header cutout, oil pickup tube, 2002-04 WRX oil cooler assembly, and 2002-04 WRX oil feed pipe
WARNING: Operating, servicing and maintaining a passenger vehicle or off-road vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service your vehicle in a well-ventilated area and wear gloves or wash your hands frequently when servicing your vehicle. For more information go to https://www.P65Warnings.ca.gov/passenger-vehicle.