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Trackside with the 2010 Audi S4

The Audi S4 sports sedan

The visible differences between the A4 and S4 are subtle. However, the performance differences are quite obvious.

(Credit: Antuan Goodwin/CNET)

I was recently handed the keys to a fully loaded, brand-new Audi S4 sedan. So, I did what any motorhead would do in this situation and proceeded to put ...

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