Was taking off the rear shock last night and had to remove the back half of the exhaust to get the air box out of the way. Well when I took it off (exhaust) it seems that there is a deep groove around the inside of the exhaust pipe. Pieces of stuff fell out all over the place out of this groove. I do assume it is a gasket of some sort. Am I right and can I get a new one? Hayden. New to me 94 XRL.