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2004

  1. LQ-9 Swap into an 2004 GTO. Need help

    LS1/LS2 Engine Tech
    So I took my car to the shop to get it tuned and a few other small things. When the car was there it started to push coolant and luckily it didn’t hydro lock the engine. Went to have heads decked and as they were going to put the “new” heads on they noticed that 6 of the head bolts were grade 8...
  2. Muffler help

    Exhaust
    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...
  3. Noobie Exhaust Question

    Exhaust
    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
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