The APR Multi Port Injection (MPI) System includes four 980cc ethanol-compatible Bosch Motorsport MPI injectors, harness, fuel rail, rail sensors, distribution block, and everything needed install the system to the factory intake manifold. This system is designed for use only where required by an APR turbocharger system upgrade with matching software. Fits Audi A3 17-19, A3 Quattro 15-20, Q3 21-24, S3 15-20, TT Quattro 15-23, TTS Quattro 16-23; VW Arteon 19-21, Golf R 15-19, GTI 15-21, Jetta 19-24