Equal Length Design

The equal length design of the PERRIN header, gives you the best of two worlds.  Smoother flow of exhaust to the turbocharger allows turbo to spool quicker giving you horsepower and torque are increases thought the entire RPM band. 

Designed to fit to the factory uppipe, our header will mate with an OEM or  aftermarket uppipe, as well as any rotated turbo kits compatible with the factory header.

Slip Joints

Slip fit joints are used to allow the header to expand and contract under extreme conditions. Slip joints are very tough & durable compared to fragile flex joints which are sometimes constructed of weaker metals. Constructed of 100% 304 stainless steel ensures your headers will last a long time!

Flanges

PERRIN Flanges are CNC machined from 304 stainless steel and counterbored on the back side to make smoother transitions from heads to tubing and header to uppipe.  

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.

Click Here for a sound comparison video!

Port Matching

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.

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, we can create a smooth transition of the header primaries to the collectors, and collectors to uppipe, providing more power and torque then the competition.

Dyno Chart Showing HP and TQ on Stage 3 Legacy GT

This graph illustrates the significant torque gains throughout the power band.  This car was a 2005 Legacy GT with a Stage 3 setup.  This includes a PERRIN TMIC, ECU retune, Turboback exhaust and uppipe installed. The only change between runs was the OEM header for the PERRIN Header.  More than 20WHP and 30ft-lbs of torque was gained!  This Graph also represents what you would see on a 2008+ WRX.

View Larger Graph

Dyno Chart Showing HP & TQ on Stage 2 STI

This graph illustrates how the header works on a common Stage 2 STI.  This includes a Turboback exhaust being installed and an ECU retune. The only change between runs was the OEM header for the PERRIN Header, no ECU tuning!  More than 15WHP and 20ft-lbs of torque was gained!  

View Larger Graph

Dyno Chart Showing HP & TQ with GT3582R Rotated Turbo Kit

This graph illustrates how the header works on a car with a huge GT3582R Turbo.  This has has many modifications to support the huge power from this turbo.  The only change between runs was the OEM header for the PERRIN Header, no ECU tuning!  With the boost at a reasonable 22psi and again no other changes between runs, 10WHP was gained up top.  But where this header really shines, is at lower RPMS where it spools the turbo quicker making 30WHP and 50ft-lbs fo TQ. Graph provided by NASIOC member Tim Gentil.

View Larger Graph

Dyno Chart Showing Quicker Turbo Spool

This graph illustrates the boost response of the car above. You can see how changing the header makes the turbo spool quicker.  At 22psi the turbo spools quicker by almost 500 RPM!  Graph provided by NASIOC member Tim Gentil.

View Larger Graph