+1 to k&n fipk
i just bought it for the second time for my second s2k. i bought it again just for the sound. Vtec hits like an f1 racecar.
its been provin to give small gains throughout the rpm range too. best of all it was 203$ brand new shipped to my house.

 

i hate how cai looks, it just leaves a huge gaping hole in the engine bay. just looks empty, but nice for easy access for everything
i say prm intake since gains are minimum, mind as well just go for sound. and i think this is the prm/k&n intake hybrid that was mentioned earlier

 

An intake isn't going to gain much ho so I got the one I felt sounded the best and looked good. I love my PRM. Looks great in the bay and sounds awesome. Top down + Berk headerback + PRM intake = amazing.

 

i got my k&n used here on s2ki and i love it! it sounds great, looks great and paintable if u want to. it does feel better than oem system but i dont know bout difference between k&n and the others. the plastic i prefer because its thick enough that it doesnt get hot like the aluminum ones and also still lightweight. remember the ICEMAN cold air intakes? the k&n one is almost the same as in the same plastic but not as many turns. i had mine on my SRT-4. kept cold all the way to the tb.