BBK Performance Parts Adjustable Fuel Pressure Regulators offer a simple way to tune and optimize air/fuel ratios and achieve a few extra horsepower. Each BBK fuel pressure regulator is made from high-quality CNC machined billet aluminum with a long lasting anodized blue finish. Each unit is hand assembled with a precision leak-free diaphragm that will allow fuel pressure adjustment to approximately 65psi. These BBK fuel pressure regulators are direct replacements for your stock pre set regulator.