; Meets the higher fuel delivery demands in today's race engines; Increases the orifice to nearly twice that of two regulators combined, creating a totally free flowing fuel system that allows the pumps to deliver full capacity at all times; Standard fuel systems regulate pressure before the fuel reaches the carburetors, while this system regulates pressure after the carburetors have been supplied and requires a return line to the fuel tank; Shims are included to allow easy pressure adjustment from 6-10 psi, as are complete instructions and tuning tips