BBK throttle bodies regulate air flow into a fuel-injected engine and is the integral part of a fuel-injected air intake system. It regulates air the sir volume that flows into the engine, accounting for factors such as throttle position, idle speed, cold start warm-up and more. BBK throttle bodies allow power boosts while maintaining the correct air fuel ratio to maximize power ... while avoiding destruction. No performance engine is complete until you bolt the correct throttle body to your engine’s intake manifold.