Our Power Filter feeds your supercharged engine a steady diet of cool air delivering greatly improved acceleration and rpm. Replaces restrictive stock air box with a high-volume, precision-formed intake duct that attaches to the supercharger via a large 4" adapter. Cool air enters the system via an oversized K&N filter element. Includes detailed installation instructions.Note: For heavy surf use we recommend the use of our waterproof pre-filter. Part# RK13090PF-BK.