Yeah, the stock I-pipe and over axle pipe are 2.75". The full cat-back should be one of the first mods done unless you have an SS or WS6 with the optional exhaust which is 3". I'm surprised the car has a cam and not a cat-back done to it.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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