Looking for a new drop in filter for my 8 and am trying to decide which is best for the money. I have come to 2 that I am considering which is the HKS filter and the K&N. Which is better and how much hp to expect? Any difference in sound or anything else?
Read on one sight that was selling the HKS and it said a 15hp increase. Of course that is not true, I am expecting a 2 or 3 hp increase if that for a drop in filter.

 

the drop in filters wont do much for hp. But I would go with KN just because the HKS ones have to be replaced (i think) but the KN one you can clean

 

no HP.

and try to avoid HKS filter, their flow is good but filtration is garbage.

Use K&N instead.