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Sorry foir taking so long to respond. No the mufflers were off when it was taken for emissions. IT's a rebuilt motor with 16k miles, chip, downpipe, cold air intake, 3.73 posi, shift kit, stock turbo equiptment. jet coat headers 2.5" piping high flow cat no mufflers hope that helps

The 84 Gn i'm bout to buy has headers, and no mufflers. Has cat but i cant figure out how it still passes especially in colorado, Anyone wanna shed some light on this

sup guys i'm new to the forums right now i have an 85 firebird thats going for paint and then being sold. I'm looking at buying an 84 GN rebuilt motor and turbo. Stuff like headers cai, chip posi dynoed at little over 300 hp. Stock turbo and turbo accessories. What are the spots i need to...