AEM's WRXAnd STI Cold Air Intake (CAI) features CNC mandrel-bent 6061 piping, tuned in both length and diameter to maximize power. Every AEM cold air intake is powder coated or polished and has TIG-welded fittings and brackets. For filtration, AEM utilizes its new reusable lightweight urethane, four-layer cotton-gauze filter that features a redesigned air horn for improved performance. All AEM WRXAnd STI cold air intakes are C.A.R.B. exempt or pending exemption (50 state legal) and come with complete installation hardware, comprehensive instructions, an AEM decal and license plate frame.