I didn't know about the yoshimura pipe because the most horsepower you get from it is in the higher RPM's but where i need the power most in right when the motor starts to bog down going up a big dune so i need the mid range power more than i need the top end power(unless all i did was drag race)

 

black widow

I am also running stock exhaust.........will you email me and tell me what exactly you did and what performance gains you got from it?

joshwulf@hotmail.com
thanx
Josh

 

The Yoshi fullsystem is what we run on both our 400ex and our 300ex..It was rated VERY well for the EX and the Raptor.Its got a good power curve from top to bottom on this pipe...And it sounds great...