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ProCharger self-contained ProCharger models are the first and only gear-driven centrifugal superchargers to feature self-lubrication. In addition to the patented self-contained oiling design, SC ProChargers also feature the highest step-up ratio, exclusive billet impellers, and the industry's only billet gearcases for superior rigidity, sealing and appearance. The best-selling P-1SC shares many of the design elements which deliver the record-setting durability and performance of ProCharger competition superchargers, and is also quiet and street legal.