PERRIN - Equal Length BIG-Tube Header (inc. 02-14 WRX / 04-17 STi)
   Quick Product Info
Brand: PERRIN Performance
Part #: F-PER- PSP-EXT-052
Design: Equal Length
Installation Hardware Included: Yes
Material: 304 Stainless Steel
Mfgr. Warranty: 5 Years
Weight: 12.5lbs
   Confirmed Applications
2004-2017 Subaru STi
2008-2014 Subaru WRX
2005-2009 Subaru Legacy 2.5 GT
2006-2009 Subaru Legacy 2.5 GT spec.B
2006-2013 Subaru Forester XT (See notes)
2004-2005 Subaru Forester XT (See notes)
2006-2007 Subaru WRX (See notes)
2002-2005 Subaru WRX (See notes)
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Product Details

Equal Length Design
The equal length design of the PERRIN header, produces smoother more balanced exhaust pulses flow from the head 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, their header will mate with any aftermarket up-pipe that works with the OEM header.

You wont see grossly, way over sized tubing to make their header LOOK better. That just slows down exhaust gases and loses response. The PERRIN Big Tube header uses 1.625" primary tubing that fits the Subaru exhaust port size. Their larger diameter header was designed for cars making 500+ wheel HP to not sacrifice low end power on cars with big aftermarket turbos installed. For those looking for more HP from their stock turbo to slightly upgraded turbo, we suggest to look at their Regular WRX/STI equal length header.

PERRIN Flanges are CNC machined from 304 stainless steel and counterbored on the back side to make smoother transitions. Flange ports 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 causes gaskets to burn out quickly.

Because of it 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.

Oil Pan
Most headers collect on the passenger side of the engine, and due to space constraints, are not equal length, compromising exhaust flow. Because they use the added room provided by the oil pan (only on 2.5L turbo pans), they can create a smooth transition of the header primaries to the collectors, and collectors to up-pipe, providing more power and torque than the competition.

2002-2005 Subaru WRX requires oil pan with header cutout and oil pickup tube.
2006-2007 Subaru WRX requires 2002-04 WRX oil cooler assembly and oil feed pipe
2004-2005 Subaru Forester XT requires oil pan with header cutout, oil pickup tube, 2002-04 WRX oil cooler assembly, and 2002-04 WRX oil feed pipe
2006-2013 Subaru Forester XT Requires the 2002-04 WRX oil cooler assembly and oil feed pipe

The PERRIN Performance Header not compatible with header wrap material. Using Header wrap will void all warranties.
The PERRIN Performance Header will not fit Moroso 20965 oil pans