Increase Fuel Pressure For Optimum Performance Precision Design Bolt On Installation If youve increased your horsepower with a throttle body, mass flow, free flow exhaust, Bigger Turbos or Performance Software , there is still one thing missing! More fuel when you need it. With our High Performance  Adjustable Fuel Pressure Regulator, you can adjust the fuel pressure  higher to give you the fuel necessary to gain maximum horsepower. The result is quicker acceleration and better throttle response. This is the missing link to the high performance you expect from your vehicle. Legal in California only for racing vehicles which may never be used upon the highway. Learn More