Large Three Layer Performance Air Filter:Momentum*s unique filter-to-housing interface was built to feature the largest air filter possible. This 7-1/2* tall 360-degree radial flow air filter features a 3-1/2" flange and our oil-free Pro DRY S media with three layers of synthetic media for maximum convenience. Its progressive layering provides great filtration efficiency and dust holding capacity, while not requiring the use of oils. This media is best suited for street use. Its inverted top makes for more filter surface area, resulting in longer service intervals.Unique One-Piece Housing:The smooth one-piece sealed housing, constructed of heat-resistant cross-linked polyethylene (XLPE), features our patented/patent-pending filter-to-housing interface. Its innovative design minimizes the total number of parts, making for an easy installation. A clear round sight window, resembling the VW logo, allows for hassle-free filter inspection without having to disassemble your system. The housing incorporates the OE air inlet and features an additional auxiliary air inlet that can be plugged if desired.Dyno-Tuned Intake Tube:This system features a high quality, computer-designed, dyno-tuned intake tube to achieve maximum power gains while maintaining a perfect fit. Its XLPE material is heat soak resistant and extremely durable.Premium Components:Stainless-steel clamps and a silicone coupling are included for strength and durability, while also providing the most secure installation available. Momentum GT intakes are designed with fewer parts for a fast and easy installation. Momentum GT Cold Air Intake System w/ Pro DRY S Filter Volkswagen Golf R 15-19 L4-2.0L (t) Volkswagen Golf R 15-19 L4-2.0L (t)