I've been reading a lot of posts from people who have installed CAIs. I see a bunch of cold air intakes on BMW's that come in the shop. Mostly on 335's and 135's. They appear to be more like hot air intakes because they seem to be pulling in hot air because of their location. I don't see how that is more efficient than the stock air box. Again, I am referring to the BMW CAIs that I've seen. The Crossfire CAIs that I seen, have a longer run and draw air from the grill. That makes more sense to me but I've also heard people say that the have lost hp after installing cold air intakes. Whats fact and whats fiction when it comes to CAI? Don't manufactures spend millions in R/R to develope their intake designs to make them efficient. I know a lot has to do with CAFE standards as well. Someone please clear this up for me. I guess I'm not up to speed on the performance side of being a technician. I just mainly deal with check engine lights from vacuum leaks and issues that have been caused by people ******* with their cars. Please educate me