The JET Performance Adjustable Fuel Pressure Regulator Kit is a direct replacement for the factory unit and contains a billet adjustable fuel pressure regulator with a steel insert on the adjuster to prevent stripped threads. Includes all necessary gaskets and a heavy-duty replacement diaphragm. The fuel pressure regulator kit allows for precise tuning of fuel pressure to accompany other performance modifications such as performance air filters, air intake kits, exhaust system modifications, throttle body spacers, performance camshafts and intake manifold upgrades, etc. Restores lost performance due to a worn out stock regulator. Kit reuses factory spring.