Guys ,Looks like my current rear muffler box (exhaust) living on borrowed time. Need to replace. Options:1) Op 1 - original BMW cost > RM1,xxx 2) Op 2 - purchase "good" after marketAny leads on a) recommended exhaust shops b) particular brand (if any)c) price range expect to payd) are there such thing as replica for exhaust systems ??Only concern I have with using non-ori part - being a manual ride I do not want to loose any "power"3) Op 3 - any forum member has rear muffler (excellent to good condition) for salergds