Even in this day of increasingly sophisticated electronic fuel control systems, carburetors are still often the component of choice for racers and high-performance street machine enthusiasts alike.

Your car's engine needs a very specific diet of air and fuel to do its job, and it's the fuel pressure regulator's (FPR) job to feed it the right amount. The gadget is relatively tiny and can fit in ...

ABasics of the Superjection system include the mass airflow sensor tube, computer module, and four-injector throttle body. Adjustable fuel pressure regulator (upper right) feeds approximately 39 psi ...