Create a smooth sounding exhaust note while increasing horsepower and torque with the PERRIN E4-Series Equal Length Header.
- Material 304 Stainless steel
- Finish Brushed
- Outer Diameter - Normal 1½"
- Outer Diameter - Big Tube 1⅝"
- 2002-2005 WRX - Yes, 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 - 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.
- 2009-2013 Forester XT - Yes, no modification required
- 2004-2007 STI - Yes, no modification required
- 2005-2009 Legacy GT - Yes, no modification
- 2008-2014 WRX - Yes, no modification
- 2015-2018 WRX - No
- 2008-2014 STI - Yes, no modification
- 2015-2019 STI - Yes, no modification
- CSF Radiator with Built-in Oil Cooler - No
- KILLERB Cast Oil Pan - No