Bought a lightly used magnaflow axleback for my 07 and after pulling off the flowmaster muffler, I tried installing the Magnaflow muffler and with the clamp fully tight, it was still loose. Anyone ever have this problem? I think I have a pipe expanded, so I may try opening up the stock pipe that the muffler slips on to. Pretty crazy how heavy the flowmaster is in comparison to the Magnaflow muffler.