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 wheels, 48.6mm inducer, 60mm-62.3mm exducer with extended tip (9 blade configuration) Ultra high-flow exhaust wheel, (9 blade configuration) Upgraded thrust bearings Bolt-on fitment with existing exhaust manifolds Perfect upgrade for all 4.0T owners who are looking for 800 hp (with supporting mods)