How many miles on the T-pipes? I had some chrome issues on my original T-pipes and got new shells. I pulled the baffles out to change them over and found most of the packing was gonzo. I bought some replacement packing and repacked them and they mellowed right out...
Moose Racing Fiberglass muffler packingThe Moose packing idea came from Pat/Dinqua originally.
Credit where credit is due.