Years ago, the complicated machining required to fabricate the rotors of a twin-screw compressor restricted the design to industrial applications, but thanks to CNC machining the cost to manufacture these parts have dropped significantly. Kenne Bell, Whipple, and Vortech-Lysholm are all producing screw-type superchargers and supercharger kits for modern and classic cars, including Mopars. Twin-screw systems generally give more hood clearance than Roots superchargers, as air can enter at the rear instead of the top. The screw-type supercharger also needs less maintenance than the Roots, since no Teflon seals are required on the rotors, making it a great choice for your Mopar.