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  1. Muffler help

    Hey yall! I'm looking to make my car a bit louder and my stock mufflers keep grinding on my drivetrain so I figured I'd kill 2 birds with one stone and swap my mufflers out with some glasspacks considering that's the only mufflers I can find that can be a direct replacement, so here lies my...
  2. Noobie Exhaust Question

    Hey guys, I recently purchased a rather nice 04 GTO and was looking to modify the exhaust, I was wondering if anyone knew if a cat back, like this one (loudmouth slp31060) would throw a check engine o2 code