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gm has stated befor that a cat back is fine but you cant replace the cats unless they are direct replacements. GM will void the warranty. removing the factory cats is illegal. So you can go to court and prove that the cats didnt cause the problem but when the judge hears that you illegally modified your emissions system the judge will dismiss the case.
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real ZL1 wheels and brakes, 285/305 Michelin Pilot Super Sports, Pray ported Intake manifold, Soler Throttle Body, Rotofab intake, EFI Tuning Flex fuel kit, full American Racing Headers Exhaust, 1 7/8" w/ cats H pipe and mufflers. Full 1LE suspension, with BMR adjustable sway bars and links, GM aluminum cradle bushings, Hurst shifter with lighter reverse spring, TWM shifter knob, Tick level 1 transmission. I should have bought a ZL1
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