Get the right ring From Frank. The cyl is fine I bet. The reason why you exhaust bolts stripped is because you did not add a brace to the far end of the Jteck muffler. It is not good at all to support a exhaust with just 2 bolts.On a stock exhaust....the weight is so lite you can get away with only 2 exhaust bolts. Good Luck.....Capt,n