Buzz after AAM Short Tail install

Schsplayer00

Thank god Im not the only one, I have the AAM short tails as well i did have the dealer take off the heat shield as instructed to, so the sound is not from that. I have narrowed it down to the plastic around the hatch window. Just like you it only happens when accelerating fast around 3500 to 4000 rpms, then again it only does it sometimes usually if i tap on it one good time it stops. When the plastic vibration sound is not there i think they sound amazing I love them inside sound and most def. the outside sound its way meaner and deeper than most of the other Z's around here with other exhausts. The plastic vibration is my only issue and i would really love to find a solution to it then it would be perfect. If you figure anything out let me know and i will do the same.

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09 White/black Touring/Sport<HKS true dual exhaust burnt tips, Stillen G3 intakes, Berk test pipes, Motordyne intake manifold, Motordyne thermostat, Stillen under pulley, Uprev tune.