Hey all. I'll try to keep this short but specific. Any help would be greatly appreciated. I have cat back magnaflow comp series exhausts on my 2015 charger. When I'm at roughly 2-4 thousand rpm's I start to get that deep sound followed by a rattling noise. I can't tell if it is under the car (exhaust related problem) or in the backseat. Has anyone had an issues with any interior panels rattling? If so which ones and what is the fix? Thanks in advance!