Cummins 4BT with P-Pump Nozzle Set: Nozzles can support up to 480 RWHP. Largest nozzle set recommended for frequent street use. Modified P-Pump and upgraded turbo(s) are required. Recommend timing set to 20-22 degrees. Recommend having nozzles installed, and injector opening pressure set to 270 BAR by a qualified professional.