AEM pioneered the Cold Air induction system for sport compact cars. Our air induction systems create more power than any other systems of their kind. AEM original Cold Air and most Version2 (V2) induction systems relocate the filter outside of the engine compartment for a cooler intake charge, and our Short Ram systems are an economical underhood alternative to our Cold Air systems. We have found that inlet length plays a vital role in the power production of V2 systems and not all V2 induction systems relocate the filter outside of the engine compartment. In these cases, extensive temperature testing was performed to locate the filter in the coolest area of the engine compartment to achieve the lowest inlet temperatures possible (please see our temperature testing procedures on our application page). 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).