Perrin E4 Series Equal Length Header – Subaru WRX 2002-2014 / STI 2004-2021 (+Multiple Subaru Fitments) Perrin Performance

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

Designed For Power: 

The Perrin Equal Length Header comes with collectors that have been designed for better exhaust flow while allowing the headers to be constructed with increased accuracy. The improved exhaust flow and precise construction increase power and reliability, while the low-profile design allows for excellent ground clearance. 

No Tuning Required:

Increase horsepower and torque without ECU recalibration or tuning! This part is designed and tested to work safely on your vehicle without any tuning required! However, more power can be gained with proper ECU tuning! Confirm any tune or calibration you add is specific for ALL modifications added to your vehicle. 

Equal Length Design:

The equal length design of the Perrin 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 the factory up-pipe, our header will also mate with an aftermarket up-pipe that fits the factory header and turbo, as well as any rotated turbo kits compatible with the factory header. 

Specifications: 

• Material 304 Stainless steel
• Finish Brushed
• Outer Diameter 1½”

Fitment Notes:

• 2002-2005 WRX – Yes, requires oil pan with header cutout and oil pickup tube
• 2002-2005 WRX Automatic Transmission – Yes, requires modifications to radiator and radiator line to the transmission
• 2006-2007 WRX – Yes, 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
• CSF Radiator with Built-in Oil Cooler – No
• KILLERB Cast Oil Pan – No