The JET TBI Billet Aluminum Adjustable Fuel Pressure Regulator provides you with the ability to adjust fuel pressure for maximum efficiency and horsepower gains. Factory TBI regulators are not adjustable and wear out over time due to weakening internal spring tension which reduces power and mileage. Stock vehicles with high mileage can restore lost power by simply replacing the regulator and performance built motors benefit from the ability to precisely meter fuel delivery. The JET Regulator is a direct replacement and features a steel insert on the adjuster to prevent stripping unlike other designs. Precision machined out of billet aluminum by JETs in house CNC machine shop.