You mean like the Q7 V12 TDI, it has the performance of the proposed X6 M50d or whatever it will be called, or are you talking about a sedan? Before Audi introduced the twin turbo V6 TDI A6 the magazines were calling it the S6 TDI. Certainly this will be quicker than the closest Audi version but performance wise it will be around what the 550i is.