I have a MAC 2.5 inch Cat back system on my car and i love the sound it makes and i love the quality of the system but i just have one problem. Where the exhaust loops over the rear end it beats against the frame and causes an annoying rattle. Has anybody else had this problem and how did you fix it, I'm prob just gonna put a piece of rubber between them (heat resistant of course) but would like some opinions. Thanks for your help guys