Originally Posted by Big-Foot

FWIW - We dyno (Dedicated Superflow 901 Engine Dyno - not Chassis Dyno) tested the K&N filter against a standard paper element filter on a 650 HP V8. The dimensions of the filter were 14" diameter - 4" tall. There was absolutely no difference in HP or BSFC (fuel consumption).

All else equal (factory filter is of sufficient flow capacity and is in good condition) -

I think that we may modify our driving styles to prove to ourselves that the aftermarket filter made a difference in FE / HP.

I also believe that controlled studies (where the driver does no know what filter is in the vehicle) will bear proof..

All that said -

There is a GREEN side to the story here. The K&N is re-useable after it has been properly washed, dried and re-oiled. That means less cr@p headed to the landfill.