Unique One-Piece High Quality Housing W/ Sight Window: A custom CAD designed roto-molded housing made from heat soak resistant material eliminates the use of multiple components and ensures the coolest air intake charge available thanks to the massive built-in air scoop. A large clear sight window allows for filter inspection without removal of the air box. The roto-molded housing is made out of black cross-linked polyethylene. (US PAT 9440175) For Filter-to-Housing Interface. High Quality Tube: This system uses a high quality plastic CAD designed, dyno-tuned, roto-molded intake tube to achieve maximum power gains while maintaining a perfect fit. Large 5-Layer Performance Air Filter: This intake system utilizes a pre-oiled, large, 7-1/2" tall conical inverted top 360 degree radial flow performance air filter with 5-layers of progressive finer mesh cotton media providing maximum airflow and performance.