Am i correct in thinking that the A6 and S6 have different bumpers. Have noticed that the rear bumpers on an S6 show the twin tail pipes whereas thos on the 4.2 A6 don't show them as much. Is it possible to replace the A6 ones with the S6 Also what is the cost of replacing the Mirros to the chrome ones shown on the S6 (very nice ) !!!! one last question........which is better saloon or Avant ???