There Breather Filters and they used to be $7.99 at Autozone. I noticed that I lost power when I put them on rather than gain power, so instead I put a larger diameter hose running from my Injen Intake Pipe to this other chrome solid breather valve that is sealed but has a foam filter inside of it that way I don't suck up as much oil through my intake pipe. Seriously if you want the K&N mini breather valves then I hope your going for looks because they don't add any power because your sucking in hot air right next to the head and intake manifold and not allowing your intake system to get the cooler air down further away from the hot parts of your engine, and by keeping the hose connected your cycling out the hot engine air enough to where it will keep your engine a little cooler and you are getting plenty of sealed cold air from your 100 dollar intake system that you bought, that is why you bought it right? Lol take my advice I have removed all the EGR valves and tampered with everything there is with the intake manifold and vacuum assembly and don't waste your money or if you do then invest in what I explained above.
$8.00 for the sealed foam filled oil catching breather
$FREE just because I have so much hosing lieng around to connect from intake to PCV breather valve
and if your intake has other vacuum nipples on it then I would cap them unless you are usinig one of them for your Idle Air vacuum hose like me.
Hope this helps later luders!