E4-Series Equal Length Big-Tube Header

PSPEXT056

1 Hour


Part Number
PSP-EXT-056

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov

Was: $1,090.00
Sale: $981.00
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Description


Create a smooth sounding exhaust note while increasing horsepower and torque with the PERRIN E4-Series Big-Tube Equal Length Header


Completely Redesigned - What's new

The new PERRIN E4-Series Big-Tube Equal Length Header comes with collectors that have been designed for better exhaust flow while allowing the headers to be constructed much more accurately. The improved exhaust flow and more precise construction increases power and reliability. The new E4-Series also has a low-profile design, allowing for lots of ground clearance.




Equal Length Design

The equal length design of the PERRIN E4-Series 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 to the factory up-pipe, our header will also mate with an aftermarket up-pipe that fits factory header and turbo, as well as any rotated turbo kits compatible with the factory header.




Perfectly sized for more HP

You won't see grossly over-sized tubing to make our header "look" impressive, this just slows exhaust gas flow and reduces response. This header uses 1.625" primary tubing that is expanded at the flange to fit the Subaru exhaust port size. This size tubing is perfectly designed for cars making more than 500WHP. You can see from our dyno graphs that there is a significant gain in horsepower and torque across the entire RPM band compared to an OEM Subaru header. For those looking to get more power out of their stock turbo, check out our E4-Series 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 are 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 would cause gaskets to burn out quickly. The tubes are expanded inside the flanges for a perfect fit and smooth flow of exhaust gases to the tubes.




Sound

Due to its 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. A byproduct of the equalization is a significant reduction in the volume of your exhaust sound. Some describe the sound as being similar to an inline four cylinder engine exhaust.


Finish

PERRIN headers feature a brushed stainless steel finish.


Oil Pan

Most headers collect on the passenger side of the engine, and due to space constraints, are not equal length and compromise 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.

2.0L WRX engines will need the 2.5L STI oil pan install kit. Please shop our installation kits for more information.




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

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




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 thick, causing a hot-spot in the middle of the flange. These will warp the flanges of your PERRIN exhaust part, causing a permanent exhaust leak that will not be fixable with a new gasket.

Support


Warranty Details

This product features a 5 year warranty Read Full Warranty


Tech Department

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Specification

Specifications

Weight 12 lbs.
Material 304 Stainless Steel

In The Box

In The Box

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

Dyno Charts

Dyno Charts

Proven Horsepower


PERRIN E4-Series Big-Tube Headers on a 500+ HP setup


PERRIN E4-Series Big-Tube Headers vs. PERRIN E4-Series Headers

Compatibility Notes

Compatibility

2002-2005 WRX *Requires oil pan with header cutout and oil pickup tube.
2002-2005 WRX Automatic Transmission Yes, requires modifications to radiator.
2006-2007 WRX *Requires 2002-04 WRX oil cooler assembly and oil feed pipe.
2004-2008 Forester XT *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
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
2015-2017 STI Yes, no modification
CSF Radiator with Built-in Oil Cooler No

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

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.

Sound

Sound



Keep in mind, these tests are ONLY for comparison purposes to help provide an answer to the question "How loud is this?" These tests are not saying any of these systems will pass any local law pertaining to a decibel limit for your car. If you are unsure of a system passing a local decibel limit law, please have a profession test your exhaust to determine if it’s legal.

Details

Shipping Information

  • Item Requires Shipping
  • 19.0 lbs.
  • W9.0000” x H14.0000” x L27.0000”
  • This item ships in its own box.