Our Adjustable Fuel Pressure Regulators are manufactured from 60/61 aircraft aluminum and a stainless steel adjusting screw.  The vacuum port is manufactured from high-strength brass providing years of use and installs in about 20 minutes.  This Kit boosts HORSEPOWER and TORQUE and helps provide optimum air/fuel ratios for maximum HP gains .  (Depending on engine and MODs, 6 to 20 Horsepower at the drive wheels especially in the higher RPM's.)  All Kits are safe, reliable, and durable.