AEM pioneered the Cold Air induction system for sport compact cars. AEM air induction systems create more power than any other systems of their kind. AEM Cold Air induction systems relocate the filter outside of the engine compartment for a cooler intake charge. Every AEM air induction system is individually tuned in length and diameter, and features the highest standards of construction?we even guarantee them for the life of your vehicle. Every AEM air induction system is either C.A.R.B. exempt, or pending C.A.R.B. exemption (50-state legal). Fits AEM BMW 325i / Ci / Xi , Exc HID lights 2001, 2002.