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Fitment Information: 2015-2021 Subaru STI The Cobb Redline Carbon Fiber Intake seamlessly blends performance and aesthetics to bring the ultimate intake for your 2015-2021 WRX STI. Constructed of 2×2 twill carbon fiber and finished in a high-quality gloss clear coat the intake system’s presence in your engine bay does not go unnoticed. Features: 2×2 Twill Carbon Fiber Weave High Quality Gloss Finish Bespoke COBB Redline Badging Integrated Carbon Fiber Scoop Compatible with COBB OTS Maps Easy Installation Installation Guide Tuning Required The main airbox is constructed of multiple layers of 2×2 twill carbon fiber sheets for a true carbon intake through and through. High quality gloss clear finish provides fade resistance from heat and UV light. A bespoke black Redline badge sits at the front of the integrated intake ducting. Air is filtered through a 35% larger when compared to the standard SF Intake pre-oiled filter and routed to the MAF housing which is bolted to the airbox by way of a black anodized billet aluminum adapter. The wire-reinforced black silicone coupler is sealed on either end with black anodized clamps for a very sleek install. A second billet plate can be removed from the fender side of the airbox to increase airflow and audible intake sounds of the system. Velocity Stack MAF Housing This intake system utilizes several unique features in an effort to maintain optimal flow for performance while minimizing turbulence. A custom conical air-filter element CFD-designed velocity stack and unique air flow straightener grid are designed to smooth the incoming air flow as it passes the Mass Air Flow sensor for precise readings. The one piece high temperature plastic composite design saves weight and reduces heat transfer.