Constructed from TIG-welded T-321 stainless steel with 1/2" thick flanges, the Perrin uppipe for your 2015 STI is designed to handle the extreme heat of your Subaru's turbocharged engine without warping or cracking. Bolt this product up to your turbo and you will experience quicker spool, more power and snappier low end throttle response. The Perrin uppipe includes detailed instructions and new studs to make installation of this part as easy as possible. Replacement gaskets are recommended but not included.
The Perrin Big Tube Up Pipe is for Subaru builders who are using a larger stock location turbo but are limited by the flow rates of a stock sized up pipe. The Big Tube uppipe utilizes 2" ID 304 stainless steel tubing that is CNC mandrel bent and precisely welded to perfection without the need for a flex section. Flanges are all CNC machined from 1/2", 304 stainless steel to prevent warping and port matching is done for the smoothest possible exhaust flow. A new set of 5 studs are included. Go with the Big Tube to remove restriction on your aftermarket turbo setup and make some big power!