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The N54/55 is sold in the coupe, convertible, and sedan. And it will be faster than the IS350.
Above all, the Audi S4 will smoke all of them
Again, still not in the same class. The N54/55 wether applied on a two or four door car, is still FORCED INDUCTION, the IS350 is N/A. And the s4 being a faster car is a V8, try again.