Momentum’s unique filter-to-housing interface was built to feature the largest air filter possible. This 9†tall, pre-oiled 360-degree radial flow air filter features a 5-1/2" x 3-1/2†oval flange and our pre-oiled Pro 10R media with ten layers of progressively finer cotton gauze media for maximum performance and filtration. Its inverted top and large surface area provide much longer life between maintenance intervals, while reinforced metal provides maximum strength to prevent filter collapse. This media is best suited for off-road applications. The smooth one-piece sealed housing, constructed of heat-resistant cross-linked polyethylene (XLPE). Its innovative design minimizes the total number of parts, making for an easy installation. A large, clear sight window allows for hassle-free filter inspection, without having to disassemble your system. The housing features an optional auxiliary air inlet that pulls in additional air. A plug is provided to close the auxiliary opening. 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. Stainless-steel clamps are included for strength, and a premium bellows silicone coupling allows for ample flexibility. Momentum HD intakes are designed with fewer parts for a fast and easy installation.