Foster SC Mods makes cars using twin Screw Superchargers more fun to drive. To accomplish this, we apply our sound generator technology to enhance the rotor pulses and induction sound of Twin Screw Supercharger " whine " inside the vehicle to the driver. The Foster SC Mod is designed increase natural whine of the supercharger. The Foster SC Mod makes driving your supercharged late model car more fun with even more sound. Call Beefcake Racing 1-855-827-7223 for best price and more info. Use Coupon Code FosterSCMods for Free Shipping!