DESCRIPTION CTS Turbo is proud to announce our Stage 1 turbocharger upgrade for 4.0T Audi C7 A8/S6/S7/S8/RS6/RS7 These are a direct replacement for A8/S6/S7/S8/RS6/RS7 turbos. These have OEM fit to your factory turbine housing and exhaust manifold. Our turbocharger upgrade features a larger compressor wheel giving your 4.0T a power capability of 780 horsepower Note: All TSB parts for turbo replacement have to be installed; otherwise warranty will not be applicable. Proof will be required. NO CORE CHARGE, THESE ARE BRAND NEW TURBOCHARGERS. Features: Billet compressor wheel Upgrades Bolt-on fitment Upgrade for all 4.0T Journal bearing Fitment: Audi C7 S6 4.0T Audi C7 S7 4.0T Audi D4 A8 4.0T Audi C7 RS6 4.0T Audi C7 RS7  4.0T Audi D4 S8 4.0T **Tuning Required Model Generation Make Model Year Generation AUDI RS6 2013 – 2018 C7 AUDI RS7 2013 – 2018 C7 AUDI S6 2012 – 2018 C7 AUDI S7 2013 – 2018 C7