how much hp

[AtvRider21]

how much hp would a wb e series slip on pro meg pipe, kandn filter, new jet and pilot, power bomb high flow header add thanks

[RED121572]

Im guessing maybe youll get 3 extra ponies on top. (tuned correctly of course)

[250xman]

with the pipe alone it says 4-7 HP

[bansheeguy77]

u might gain 3 or so....there is no way to get that much hp out of a 4 stroke with just a pipe.

[Big - D Racing]

I've tested a power bomb header, it only adds 0.2hp, the pipe will add about 2.5 hp, so 3 hp gain is a good estimate. Never believe what the manufaturer says. I have never tested a slip on that added 4 hp to a machine. When I test that includes k&n filter with no lid on the air box and a jetted carb versus a complete stock 400ex pipe, jetting, filter and lid on the airbox.

[RED121572]

Big D, do you have a dyno?