So if you allow the engine to breath better it won't work better ??!! How come no one has sued K&N or Nismo or Green or the other filter suppliers for false advertising a 4-5 bhp increase, even when backed up by dyno charts ??
As I said, it is not a big increase, but there is a definite noticable increase from stock.
"K & N panel filters are performance washable and reuseable versions of the OEM filter. They fit in the original airbox as a direct replacement, but increase horsepower and throttle response along with superior filtering."