The fuel pressure regulator may be small, but it plays a big role. Learn what it does for your engine and how a failing one can affect performance.

An ultra-high-performance engine, whether in a NASCAR, a Pro Stocker, or even a heavy-duty street machine, needs an incredible amount of fuel to do what it's supposed to do at high speeds.

It'll fly instead using Active Flow Control (AFC), using a series of nozzle arrays along the wings connected to a pressurized air system, capable of blowing controlled bursts of air that can directly ...