I have a 96 318ti with the M Package. I work at an auto parts store, and a K&N filter was only about $35 or so at my cost. But when I looked at the illustrations, you just threw it in the existing air box, and clamped it back down. Basically, the only purpose would be to reuse the filter, because it is not gaining any air flow. I dont want to modify it too much, but I do want more power. Alot of the new intakes I've seen do not have any places for my sensors, and thats not an ordeal I want to get myself into.
What I was going to do is take out my existing wix airfilter, leaving the air box empty. I was then going to make my own metal tube going downwards towards the ground, and make a customized heat shield, so the air is infact cold. That way, I will have all my sensors still intact, making one less problem I could face. Or if anyone knows of any brands or model numbers of a cold air intake for my BMW, that doesnt require any modifications, that would be great also.
Ive never tried this before, so any help would be great! And Im also new to this site. So thanks in advance!