Like K&N but much higher quality. Green oil instead of red - my K&N has half green oil because I finished off my Green filter oil before starting on a new can of red K&N.
Originally Posted By: Corelokt
I'm waiting for a fram 4" inlet cone filter. Orange rubber of course.
Lol. I'll spray mine with cooking oil, too!
Seriously though, for my Focus ST I just bought Motorcraft. Cheap, works, there is enough surface area that I am not sure they're a factor in air flow.