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Yeah, sims will help you pass but if you pull in with hollowed cats and they can smell that the exhaust doesn't seem right they can still put it on the rollers and do the sniffer test which it would obviously fail. My 96 SS with longtubes and no cats was obvious that it didn't have cats just from the exhaust. It all depends on the inspectors working at the time and what kind of day they're having.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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