The new S4 is a 334hp 4.2 liter v8, with all wheel drive. They compare to BMW M3. S4's are very much better than the A4 by a long shot. I think the late S4 is 2.8ltr turbocharged, so there not much of a difference either way. S4's are a step way above the A4, and I beleive all thats offered in the A4 is either a turbo 1.8 or a n/a 2.8. S4's are awesome.
