Alright guys... I am leaning toward the yoshimura pipe for my KFX 400. I am unclear on the performance difference between the "comp" pipe and the "pro" price is a big difference but can anyone tell me more? I want the best so I am leaning towards the pro... but any help would be greatly appreciated [img]i/expressions/face-icon-small-smile.gif[/img]

Thanx Guys

 

Well they are both full systems which you want..more power..id go with the Pro series as well...well the Pro series is made more for racing and track use...it lighter and has better air flow than the comp series..on the other hand the comp series is a full system as well...but does perform like the Pro series both are great pipes but the Pro series youll see more of a power gain across the board...also the Pro series is probably going to be really loud..but it will sound nice...Yoshimura pipes perform great on the KFX400..your going to need to rejet too as you know already...