power gain ??

[kfx400fat]

whith a k&n air filter and whith a sport serie slip on how much hp can i gain and do i need to rejet it ?

[Justin/HMF]

whith a k&n air filter and whith a sport serie slip on how much hp can i gain and do i need to rejet it ?

You can expect gains of ~ 5 HP over stock on a slip on and ~ 6 1/2 HP over stock on a full system. Jetting is required after installation of a exhaust system for optimal performance of your quad and to retain the HMF manufacturer warranty against defects.