Racing Adjustable Fuel Regulator Pressure It can prvide precise consisten noost as much as twice of the factory fuel flow Manage your fuel system requirements, increase fuel delivery by rasing pressure Fuel Pressure Regulator can deliever high performance, with long life and high reliable operation Increase fuel delivery by raising pressure around 5-10 horsepower All accessories are included for installation Professional installation in highly recommended (No instruction included) Adjustable 0-140 PSI(0-10kg/cm²) for maximum fuel pump capacity.