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My car with the stock tune had a little bit of pop to it once in a while decelerating. GMMG is definitely not one of the better flowing cat-backs(chambered pipes do not flow very well) but it sounds good and is stainless which is nice. Maybe your computer is making adjustments after you've driven it around a bit. A more restrictive exhaust would not pull raw fuel into the exhaust stream like a freer flowing exhaust will so that wouldn't cause the popping.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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