Perrin Equal Length Header 2002-2014 Subaru WRX / 2004-2018 STI

The 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 constructions increases power and reliability.  The E4-Series also has a low-profile design, allowing for excellent ground clearance.

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.

Please note that the 2.0L EJ20 engines will need the 2.5L STI oil pan install kit. 

Fitment Notes:

• 2005-2007 WRX requires 2002-2004 WRX oil cooler assembly and oil feed pipe.
• 2002-2005 WRX requiress STi 2.5L oil pan and oil pickup tube as well as custom modification to the radiator line to the transmission.
• 2002-2005 WRX with Automatic transmission requires modifications to radiator.
• 2004-2008 Forester XT requires STi 2.5L oil pan, oil pickup tube, 2002-2004 WRX oil cooler assembly and oil feed pipe.

Application: 2002-2014 Subaru WRX / 2004-2018 STI