As great of an engine as the 4.2 FSI is, we've seen it get replaced in the S4 with a supercharged V-6 - which makes me wonder when either: a) other models exchange the 4.2 FSI V-8 for the supercharged V-6; or b) any rumors that Audi is developing a turbo or supercharged V-8 to compete with the twin-turbo V-8 that is now found in the new BMW 750i or X6 50i?