AEM pioneered the Cold Air induction system for sport compact cars.  AEM original Cold Air induction systems relocate the filter outside of the engine compartment for a cooler intake charge.  Each AEM Mazdaspeed air induction system is individually tuned in length and diameter, and features the highest standards of construction that Injen guarantees 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).