The APR Intake System includes a full back tube and turbo inlet adapter. However, this allows you to convert the GTI/A3 style system (CI100052) to the Golf R/S3/Arteon style system (CI100053) which features a larger turbo inlet pipe at the turbo end, and a DV recirculation port for the throttle mounted Diverter valve. This pipe can be used when upgrading to the continental turbo or other hybrid or direct replacement turbocharger systems that require a larger turbo inlet, and require DV recirculation on the hose. Fits Audi A3 Quattro 22-24, A3 22-24, TTS Quattro 23; VW GTI 22-24