Foster SC Mods a pioneer in Supercharger and Sound Tube enhancements. All their kits have undergone extensive development to give you the absolute best results possible and maximum rotor sound. Foster SC Mods 192 Sinclair Rd Sinclair, Maine, 04779, U.S.A 1 2072314112 https://www.fosterscmods.com/supercharger-whine-the-sound-of-power/