I am at the point I do not like the stock muffler anymore. It's been a while since riding 450 four strokes and thought the stock system would be ok till I got use to the bike, well I'm ready for a change. From what I've read the 09 ti header is good and really do not want problems with burnt pants or problems changing the oil. So what I need to know is will the Fmf 4.1 ti muffler alone with jetting changes make a huge enough difference. Looking for more bottom and mid mostly. Any other slip on feedback would be welcome as well.