RE: best muffler for a super tiger .90
for a boost in rpm you can either get a muffler from Jett engineering or the ultrathrust muffler..anything has to be better than the stock unit..I know I have one and it's butt ugly!!(imo)
worst of all is i have a spare jett muffler from one of my 90L's which will use a mac's pipe and I still havent swapped them over[X(]