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Anyone have the part number to our CAT? Or does anyone know which GM cat our cars use? I want to get a test pipe and having a hell of a time convincing any muffler shop to make me one even for $100 bucks+. If we can find out which cat our car uses I can easily find a test pipe for us to use easily. I think alot of us overlooked the possiblities of a test pipe. $40-$60 bucks and about 3-4hp and 1-3lbs of torque. Doesnt sound like much but for that little amount of money it's completely worth it and it's a easy install. I remember on my DSM 1st gen I got a test pipe for $20bucks I dyno'd a extra 5hp and 10lbs of torque! I dont think we will touch those gains because we are not turbocharged and do not rely on exiting exhaust gases to spool. But I think we will be satisfied if we can find the damn PN# or what cat we use! Thanks guys!