if you go from a slip on, then buy a header, you wont feel the difference. definately not worth 200 dollars

 

if you want top end put a 15 tooth on or a 13 tooth if you want take off power.

look into getting a jet kit with filter that would be the first step..

 

Themaxsa, Thats one of the first things I did was get the Pro design Airfilter. I order the one with the foam but got the K&N and think I going to stay with it for a while. The billett ring makes all the difference in the world on how good it mounts with out that restrictive core inside the stock filter. If you order one make sure it's for the 06 cause the 05 want fit. try these guys
http://www.duncanracing.com/prods/PD-246

 

camokodiak450 did you do feel any difference with the air filter change?

 

read this:

http://www.trx450r.org/forum/index.php?showtopic=1672

 

i man i just bought one it would be nice if u could let me see that too my buddys have yfzs and rs and im not to far behind but need a little boost they have an 04 trx with hot cams and jet kit k&n and18 in rear tires and 20in front and 13 tooth sprocket i need something cheap please and thank you anyones advice will help