I am new to the board, and bmw. I've just bought a '92 325i, and was wondering what to look for in a cold air intake (sorry if anyone is tired of this subject). I have found some cheapo intakes on ebay, and some real expensive ones. What is the difference, and how hard is it to install. Also, my car is a daily driver and we get a lot of wet weather here, is it better to go with an intake in the engine bay with a heat shield, or a lower ram air type behind the grill?