Additional Images

Equal Length Big-Tube Header for 2002-14 WRX & 2004-2016 STI


1 Hour

Limited Supply
Availability: Please call for availability.
Pricing: $999.00


Create a smoother sounding exhaust note while increasing horsepower with the PERRIN Equal Length Header

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, our header will mate with any aftermarket up-pipe that works with the OEM header.


You wont see grossly, way over sized tubing to make our 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. Our 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 our Regular WRX/STI equal length header.

Flanges & Port Matching

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. Some describe the sound to be EVO like similar to an inline four cylinder engine exhaust.
» Listen to the difference

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 we use the added room provided by the oil pan (only on 2.5L turbo pans), we can create a smooth transition of the header primaries to the collectors, and collectors to up-pipe, providing more power and torque then the competition. See our install kits here.


PERRIN headers feature a brushed stainless steel finish.

Jeff's Blog

Read Jeff Perrin's blog and learn why the big tube header was made and why it performs as well as it does. See it compared to our regular header and why you will need it for your big turbo kit.
» Learn More

Off Road Use Only

This product is legal in California only for racing vehicles which may never be used upon a highway. Check your local and federal laws prior to installation.
» Learn More

5 Year Warranty

PERRIN Performance warrants to the original purchaser that all PERRIN products will be free from defects in material and workmanship within a sixty (60) month period from the date of purchase. *Some exclusions apply
» Read Full Warranty

Warranty Exclusions

We will not warranty any exhaust part that fails or has warped flanges with header wrap installed. While header wrap protects the engine from heat as well as provides some performance benefits, it greatly reduces the life of any stainless steel part. Header wrap greatly increases the rate of corrosion (even stainless steel corrodes), added to that the actual temperature of the metal is much hotter, reducing its lifespan even further. Operation of vehicle without installation of splash guard will void warranty.

We will not warranty any flanges that are warped away from the weld if any aftermarket gaskets are used. Only OEM Subaru gaskets are to be used on this PERRIN Exhaust part, with the exception of downpipes for turbo kits. Subaru provides the proper crush gasket that still becomes flat when tightened (or over tightened) in comparison to aftermarket gaskets which can have a crush ring that is too think causing a hot-spot in the middle of the flange. These will warp the flanges of your PERRIN exhaust, causing a permanent exhaust leak that will not be fixable with a new gasket.


Warranty Details

This product features a 5 year warranty Read Full Warranty

Tech Department




Product Weight 12.5 lbs.
Material 304 Stainless Steel


Unequal length vs. Equal Length

In The Box

In The Box

(1) PERRIN Big-Tube Equal Length Header.
(1) PERRIN License Plate Frame

Dyno Charts

Dyno Charts

Proven Horsepower

Dyno Chart

PERRIN Big Tube Header vs. PERRIN Header

Above is the testing performed using a 2008 STI with a PERRIN EFR7670 Rotated Turbo Kit with our normal Equal Length Header (not wrapped), front mount intercooler, catback,and other supporting mods. Other notables are that this car had the stock TGV housings installed and working, stock heads and cams. The Blue line shows the normal PERRIN header and the power it made on this setup at 25psi of boost.

We quickly swapped out the normal PERRIN header for the PERRIN Big-Tube header and ran the same 25psi of boost (no change to the ECU tune. The Yellow ling shows gains of 8-10Wheel HP after installing the larger size header. As you can see there is very little loss to low end power and gains in torque and HP across the whole RPM band.

Compatibility Detail


2002-2005 WRX *Requires oil pan with header cutout and oil pickup tube.
2006-2007 WRX *Requires 2002-04 WRX oil cooler assembly and oil feed pipe.
2004-2005 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 Forester XT *Requires the 2002-04 WRX oil cooler assembly and oil feed pipe.
2004-2007 STI Yes, no modification
2005-2009 Legacy GT Yes, no modification
2008-2014 WRX Yes, no modification
2008-2014 STI Yes, no modification
2015-2016 STI Yes, no modification

See our install kits here.

*OEM parts

Oil Pan with Header Cutout Subaru Part #11109aa151 - Est. Price $108.28
Oil Pick Up Tube Subaru Part #15049aa110 - Est. Price $26.98
Oil Cooler Assembly Subaru Part #21311aa051 - Est. Price $219.95
Oil Feed Pipe Subaru Part #21317aa02 - Est. Price $43.38
O-ring (not needed unless damaged) Subaru Part #21370ka00 - Est. Price $5.82

header diagram

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. Please call with further questions.


Shipping Information

  • Item Requires Shipping
  • 19.0 lbs.
  • W10.0000” x H18.0000” x L38.0000”
  • This item ships in its own box.