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Decel pop is all related to what is called "deceleration fuel cut off" or "DFCO". When the car is on deceleration, the fuel gets cut off and then you get the popping. You can tune for more pop...or no pop at all.
The other thing that can affect how much pop you get, even if you are trying for it, is exhaust leaks. Sometimes headers leak where they connect to cats or o/r pipe and this can decrease the pop.
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