I have an 05 EVO, and the little port on the right side of the valve cover (Im sure theres a name for it), anyways it cannot be connected to the air intake tube since the intake i have doesn't have anywhere for it to be connected (unaware of brand). Im just wondering, can i plug in an air filter/breather filer to the little port like so? Cause right now i just have the oem " L" hose just hanging there, not plugged into anything.

Heres what i mean by putting that air/breather filter on.

http://s1080.photobucket.com/user/va..._0521.jpg.html

(Not my car, its just so you know what im talking about)

 

Yes, you can. If you look up some engine room pics here at the forum, there are quite a few people who does that.

Only one concern is that some oily blowby can contaminate nearby parts, so occasional cleaning might be needed (filter itself also).