Call it the ultimate Dad’s toy, a sport sedan-lover’s dream, a German sleeper – it doesn’t matter, as long as it portrays the image of an invigorating ride that promises to be a thrill to drive. The 2007 Audi S6 is an A6 sedan with some serious modifications, the most notable of which is a detuned version of the V10 packed into the flagship S8. For S6 use that 5.2-liter engine pushes 420 horses, and works with an updated version of Audi’s quattro all-wheel-drive system to maintain control of the reins. Other enhancements include a suspension with firmer settings, unique 19-inch alloy wheels, and sport seats.