High Performance Injectors 5.9 Cummins Upgrade your diesel performance with High Performance Injectors 5.9 Cummins from BBI Injectors Direct. Engineered for improved fuel delivery, increased horsepower, and enhanced throttle response, our injectors help maximize the potential of your 5.9 Cummins engine. Built for reliability and performance, they are ideal for towing, racing, and daily driving applications.