Local ATV repair guy told me this weekend that if I added a k&n air filter to the Pioneer it would add horsepower. Essentially, swapping out the filtrate material as I understood it. Is this real? If so, would this be enough HP to notice? And would it be HP at the low or high end? This stuff is all a mystery to me.
Well...if it increases airflow ( and K&N's have proven to do so on most applications ), it should add power everywhere. How much is the question? Probably enough to feel, but that is also dependent on how well the stock system flows.
I should warn you that a large number of people feel that the K&N is not suitable for use in dusty environments. Head over to the RZR forums or Google it...and prepare to read. MUCH resentment among some members who claimed they ruined an engine.
I am undecided on them as far as ATV/SxS use. I believe the logic used is that anything that flows more air lets more grit past. I keep meaning to e-mail K&N and ask them to reply to these accusations, but just have never gotten around to it.
FWIW, i have used them in several street vehicles with no issues.