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Equal Length Big-Tube Header for 2002-15 WRX/STI

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Description

Subaru Big-Tube 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.

Sizing

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

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.

Sound

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 than the competition. See our install kits here.

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

5 Year Warranty

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

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

Support

Download Instructions


Warranty Details

This product features a 5 year warranty Read Full Warranty


Tech Department

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Specification

Specifications

Product Weight 12.5 lbs.

Video

Unequal length vs. Equal Length


In The Box

In The Box

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

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

Compatibility

2002-2005 WRX *Requires STI type oil pan and oil pickup.
2006-2007 WRX *Requires modification to the oil cooler (Please call for details.)
2004-2005 Forester XT *Requires STI type oil pan, oil pickup, and 02-04 WRX oil cooler.
2006-2013 Forester XT *Requires the 02-04 WRX oil cooler.
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 STI Yes, no modification

*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.

Details

Shipping Information

  • Item Requires Shipping
  • 19.0 lbs.
  • W10.0000” x H18.0000” x L38.0000”