Product information "TTE RS C7 RACE 4.0TFSI UPGRADE TURBOCHARGERS" 
AUDI 4.0 TFSI RS6, RS7, S8, S7, S6, A8 TTE RS C7 UPGRADE TURBOCHARGERS
BENTLEY CONTINENTAL GT V8 / V8S UPGRADE TURBOCHARGERS
 
TTE C7 RACE  is OEM RS performance upgrade turbochargers for the 4.0 TFSI. 
Same power & response as original but with added durability from an upgrade TTE bearing system, motorsport clearance, and balanced core for stage 1, 1+ or 2 tuned cars. 
This is a direct bolt-on replacement of your worn out or damaged factory RS6 / RS7 turbos.
These units are a direct swap vs RS6/RS7 turbochargers with no special software calibration required.
S6/S7/S8 will require software for RS6/RS7 turbochargers.