RS Barn offers a High Performance Billet Adjustable Fuel pressure regulator for all 944, 951 and 968 models. Our Billet regulator has a 3 layer Viton diaphragm rated at 100 psi constant, and 300 psi burst. Adjustable regulators have been used as tuners trick for many years. Fuel injection systems are generally tuned for emissions and mileage. Running 4-6 psi over stock with high flow air filters or open cone styles usually adds 6-10 horsepower and torque.