HS02SW1GTR. Fitment: This exhaust system is designed for 2002 - 2007 Subaru Impreza WRX and WRX STi models. Key Features: It comes with new gaskets and hardware. Made of high - quality 304 stainless steel, it has a 3 - inch piping diameter and a 4 - inch stainless exhaust tip. The resonated mid - pipe and single - exit design, along with a silencer, ensure a unique sound. The exhaust hangers are welded onto OEM locations for a direct fit. Notes: The Invidia N1 is known for its loud sound that might 'annoy' your neighbors. It's very easy to install - just remove the old quiet exhaust, put in the Invidia N1, start the car. If you're using the factory downpipe, you'll need a cat back adapter from GrimmSpeed, Invidia, or Torque Solution.


Using the Invidia N1 Racing Stainless Steel Cat Back Exhaust is a breeze. First, make sure your car is parked on a flat surface and the engine is cool. Remove the old exhaust carefully by loosening the bolts and disconnecting any hangers. Then, install the new Invidia N1 exhaust. The hangers are welded in OEM locations, so it should fit right in. Connect all the parts securely using the new gaskets and hardware that come with the kit. Once installed, start your car and enjoy the enhanced sound. As for maintenance, regularly check the bolts and hangers to make sure they are tight. If you notice any rattling, it could mean a loose part. Clean the exhaust tip with a mild stainless - steel cleaner to keep it looking shiny. Also, remember that if you use the factory downpipe, you need a cat back adapter, so keep an eye on that part too.