I've had my 06 gt for about a month Now, came with pypes muffler deleted axlebacks which sounded nice but wasn't loud enough for me, and i never got any popping on downshifts or decel. So i added a bbk x pipe with high flow cats... car sounds amazing and loud now. But it still does not ever pop or crackle no matter what I do ! Even my 2011 v6 with pypes bombs crackled and popped. Any ideas??