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What year is your car? If it's 96-97 then there's a really good chance you can pass with emission's longtubes and a dual cat y-pipe since they don't actually do a tailpipe test. If the computer is happy (run O2 sims for the rear O2's) then they will just stick the mirror under the car and see the cats. But, it's technically not legal because you can't alter the location of the cats and the driver's side is right up next to the manifold. If the car is a 93-95 then you will also have to pass the tailpipe sniffer test which might take some tuning.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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