Not sure about your bike, but, I put a Yoshimura on my Raptor. It looks absolutely beautiful!! It sounds awesome too. It has given it a big increase in power. The other thing to consider is noise. The Yosh system can be made really quite with there TEC inserts.
if you do that just get a slip on, the warrior does not need a header, infact its perfect for the machine, so just go with a slip on exhaust, yes yoshi is great, I have one, and they are very nice with the T.E.C. kit which added way more low end i might add
I have an '02 Warrior and run an FMF MegaMaxII, using all supplied disks, and end cap. Plus, I installed the Pro-Design filter kit w/ Uni foam filter. It runs GREAT, gained some ponies and didn't have to touch the stock jets.
My girlfriend has an 05 raptor 350. I have spoken to four stroke Tech about the same thing. If you want a torque pipe get a reverse megaphone, cone-shaped pipe like DG, supertrap or others with the same shape or if you want a smooth power delivery pipe get HMF but I think the HMF style will hinder top end if you put a high lift race cam in but Yoshi pipes are meant for high revving cams. Trinity also has a top end pipe. HMF pipes are bottom and mid range. I have two HMF pipes and they are perfect for trail racing. I sold my Yoshi. [img]images/graemlins/40BEER.gif[/img]
i have a 98 warrior, i run a dg system on it for 5 yrs and have great luck with it, when it comes to pipes its like everything else, how deep is your wallet and how fast do you want to go. good luck and ride on