Perrin

PSP-EXT-050

Perrin Performance Equal Length Header PSP-EXT-050

Headers

Fitment: Subaru WRX/STI 02-14
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.
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.

Reaching back to lessons learned by tuners in Perrin's past, PERRIN has grabbed a dramatic power increase that was previously bottled up by the factory manifolds. Whether normally aspirated or turbocharged, proper exhaust gas scavenging is vastly important. The turbocharger relies on energy from the exhaust flow to rotate its blades. By freeing up energy that was otherwise restricted by the factory manifold, you can transfer that to the turbo to decrease spool up times and improve power. Perrin's R&D staff was able to manipulate the length and shape of each runner to allow easy installation and still maintain large power increases.

POWER
As shown in the dyno plot, this header makes power in all situations. In the past, headers were a trade-off: Some top end power was gained where some low end power and boost response was lost. Also, the minimal gains made the Cost vs. HP scenario not look so hot. The equal length design of the PERRIN header, gives you the best of both worlds. Tons of low end power gained and still the top end power. They find a minimum of 30Ft-lbs of torque gained at lower RPM, and around 15ft-lbs everywhere else. Same goes for Wheel HP: roughly 30 WHP at lower RPM, and about 15 AWHP every where else. Talk about the Cost vs. HP scenario looking good!

BOOST RESPONSE
Because of the design of the PERRIN equal length header, boost response is also improved. Most all cars will see about 300RPM quicker spool. This does many good things for the car. More boost at lower RPM equals more torque and more power. At the drag strip you will notice quick 60ft times, 0-60 times will be greatly decrease, and the overall fun factor of the car is greatly improved.

Features

-321 Stainless Tubing
-Equal Length Runners for each cylinder

2002-2009 Subaru Impreza WRX / STi (02-05 WRX requires STi oil pan)

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