Uppipe
PSP-EXT-100

PERRIN Performance High Flow Up-Pipe. Improve turbo spool and increase power. Fits all turbocharged Subarus. WRX, STI, Legacy GT, Forester XT, Baja & more!

Install Difficulty Rating

The First PERRIN Product

PERRIN has been known since our inception for the quality of our up-pipe. The Uppipe was the first product we ever released and has been a leader in this market ever since. Our up-pipe is one of the best ways to increase the power and throttle response on your Turbocharged Subaru. Why go with an imported imitation when you can have the original?

Precision CNC Bent Tubing

321 stainless steel tubing is CNC mandrel bent and precisionly welded to perfection. This eliminates the need for a flex joint, which is a major weakness in other uppipes including the OEM one.

Flanges

Flanges are all CNC machined from 1/2", 304 stainless steel to prevent warping. Flanges are now counter on the backside for smoother transition from header to tube and uppipe to header. The center bores of the flanges are port matched for a smoother exhaust flow. Proper sized ports increase exhaust velocity and assure gaskets will not burn out.

Critical Correct Sizing

The PERRIN Uppipe inside diameter best matches the OEM exhaust manifold outlet and OEM turbo inlet. This is critical to maintaining exhaust gas velocity increasing turbo spool up. Typically we see 250-350 RPM quicker turbo spool up after installation. Choosing a tube bigger than this can cause the turbo to spool slower.

Protect Your Turbo

On any modified 2002-05 WRX's the OEM EGT sensor (located in the upipe) can break off and destroy the turbo! Using a PERRIN uppipe protects the turbo from damage by removing the sensor all together. This irrelevant sensor is only there to tell the ECU the catalytic converter is too hot. Since the PERRIN uppipe removes the cat on the 02-05 WRX, it no longer needs to use the sensor.

Dyno Chart Showing HP/TQ on Stage 2 STI

This graph illustrates how the Uppipe works on a typical Stage 2 STI. This stage 2 car the complete PERRIN Turboback exhaust installed and an ECU reflash. The only change between runs was the OEM Catless Uppipe for the PERRIN Uppipe. 10WHP was gained almost everywhere across the RPM band. Gains on a 02-05 WRX are even greater as there is a catalytic converter being removed at the same time.