550 will not catch up Audi S6, no matter in 0 to 60 or 1/4 mile. However, I wanna say they are two different kinds of sedans. 550i is luxury, but S6 is performance. Even 535 handles more better than 550 (sporty feel). So, if wanna performance go with S6, if focus on luxury comfort, choose 550. Anyway, can't go wrong with either.
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