To the cheers of tire smokers everywhere, the past few years have seen the resurrection of the horsepower wars, with every company from Dodge to BMW offering production models with insane amounts of power. Plus, many of these new rides come with desirable styling, lots of technological goodies, and capable handling. To remain relevant, small players like Audi need to introduce models that provide more to premium buyers. The 2007 S6 does that with 420 horsepower working with the company’s heralded quattro all-wheel-drive system, upscale looks with a bit of powerful elegance, and a commitment to top-notch quality.