Can tell you from 1/4 testing, a same size k&n filter made no diff in speed/time on our cars around here.
Stock to 1000 hp engines.
We use cheap no name filters. Thier like $3, and last all summer unless the track's we're at have alot of dust/dirt blow'n around.

Not sure on your set up, but i use a cheap drop base a/clnr with a 3X14 filter on top of an RPM intake and 1/2 spacer plate.
There's still about 1/2" hood clearence.