I have a wr400 that the towns folk would like some help with. Have a White Bros e on now as it's the quieter of the two i have. Currently 5 discs which kills power but makes the bike loud oposed to friggn loud. Yes i repacked.This is a old low buck bike and i have trouble dropping $500 dollars for a muffler. What is the quietest muffler you have heard on this bike? The FMF qs used price seems to suggest a good unit.