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Start by getting under the car and find out if you have the stock cat-back which is 2-3/4" intermediate pipe or an aftermarket which is 3" I-pipe. If you're not sure, try to get some pictures and post them up and someone will be able to identify it. You probably didn't lose any power, it's more likely you were used to the sudden increase in noise which is no longer there.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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