How much of a horsepower gain are you getting? Is it really worth it? If it gives me louder noise and not many more horses then I would forget the whole idea altogether.

 

I can't give you exact HP gains but they're there. However, I've gained 4-5 Mph on the top end and it pulls much stronger out of the hole. I've had it for 4 months now. The K+N is not required BUT it worked better on my bike to lean it out. NO problems yet and I do NOT expect any. Is it worth it .........yes......for $40 how can you beat it campaired to $250+ for a slip-on and just a few more HP than the tip?? And the sound is great. I hate the loud 4-stroke bikes too, this is a nice "grumble" or more deep "throaty" sound.

 

ATV engines require a certain amount of back pressure to operate properly. Will this billet end cap mess that up?

 

No, theres way more back pressure still being caused with the tip than a slip-on or full system.