I was just curious if anyone has heard what aftermarket slip on exhaust system is working the best, I am choosing between White Bros, FMF, Yoshimura, and Pro Circuit.

 

I went with the Yoshi. full system and a 152.5 jet with lid off and it really rips. It hits the rev limiter really fast but has totally impressed me other wise. I'm sure the slip on would give you the same results because the factory head pipe looks to be the same diameter. Rev box will be available soon to fix the fast hitting rev limiter very soon.

 

I'm waiting to see which pipe is better since I haven't dealt with 4 stroke pipes that much and don't know to much about them. The 4 stroke pipe I bought was an White Bros supertrapp for my 89 Warrior.

 

I also have the Yoshi full sysyem and it performs very well. I measured the stock headpipe and it's 1 3/8'' in diameter. The Yoshi headpipe is 1 7/8'' in diameter. I lost a little bottom end but the mid and top is stronger. I also richened up the slow jet to a #125.

 

I rode Rodsquad before and after the Yosi exhaust. It is worth the 400 plus bones. Need to add a rev box for sure. The Little 400 builds great power. Anyone ordered a Trinity pipe yet???