I have an '02 XX that the previous owner put a 4 into 1 Two Brothers exhaust on.  When I got the bike it had 18K on the clock.  I am nearing 104K now.   I like the exhaust, the way it sounds and the weight savings.  My issue is that there is now a crack in the neck of the muffler, right before the can starts.  I noticed it the other day on a cold morning when I noticed a secondary puff of exhaust coming out of the hole.   I have looked all over but Two Brothers does not seem