i am new to biking and have just purchased an '89 xj600 pre diversion and the exhaust is a bit tired from the 4 into 1 joiner back, i was wondering if anyone had any ideas on replacing it as it appears that they are a bit hard to get hold of, can you fit a 4 into 1 off anything else without much modding ideally none. would really like stainless if possible. the diversion from '92 on looks very similar. any help would be much apreciated thanks kev .