I have owned the BiG Red Honda 3 wheeler, 1986 250 Honda 2 wheel Drive, 1993 Honda 300 Fourtrax 4X4, and now own a 2004 Honda Foreman 450ES 4X4 and have generally just rode the crap out of them stock and never used any type of after market performance product. But have noticed a lot of people using K & N Air Filters on their machines. I was just wondering at over $50 bucks, does this product really increase performance?