First successful 4.0 TFSI V8 RS6 to S6 turbocharger swap - MRC Tuning Audi S6 4.0 TFSI tuned for upgraded turbochargers
This seems to be flying under the radar for whatever reason but should be monumental news for the Audi tuning community. This S6 belongs to Sportmile Polska and is tuned by MRC Tuning. The turbochargers are apparently from the RS6 and it would appear they bolt on without issue. MRC Tuning was able to tune the S6 for the RS6 turbos and the result is 548.6 horsepower at the wheels according to the Polish dyno although AudiBoost is not familiar with the dynamometer used.
The dyno reads the wheel horsepower out corrected as 701.7 to the crank. Assuming the crank reading is accurate that is an additional ~280 horsepower over stock. The dual clutch transmission has not been upgraded for the additional power and torque and seems to be holding it at this point.
Budget RS6? With the addition of a dual clutch transmission? Sure looks like it. There is a video with and without launch control of acceleration from a stop as well as the dynograph below.