It get the same sound when I let go off the throttle, but the popping sound I am talking about happens when I first press down the throttle, not let off of it. And it sounds like it comes from under the hood, not from the exhaust. I know it is the H-pipe because it happened right after I drove it for the first time after I put the h-pipe on. Another thing, it seems to only do it in really humid weather. When the air is warm and clear, it is fine.
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