I think they help in alot of areas. they are reuseable, so it saves money. Cotton lets more air in than the paper ones like Fram and such. and they trap more dirt and last way longer. So it benefits everything, in my opinion. I run a velocity stack with a K&N on the chero, Its around 6 years old now. Works great.
I live by them. I have K & N Filters on all of my cars and on my race car (dirt oval racing) and a K & N Air Filter can last me 2 years with regular cleaning. Well worth the money spent at first and you can go about 7500 miles before you have to clean it. Good Luck. :thumbsup: