Hi Genie, over years of reading bike mags, especailly US ones who have money to test stuff - mostly a muffler change makes no difference at all and sometimes makes it worse. When combined with whole exhaust and carb rejet and dynatune some bikes gain something. BUT muffler only is just noise and looks.
BUT subjectively writers admit they thought it was more powerfull as it made more noise!
Spend money on more time with Karel - that will gain most difference!
Bookmarks