2010 Audi S5 quattro Cabriolet

If any engine puts the final nail into the coffin of the mainstream V-8, it's the new 3.0-liter supercharged V-6 in Audi's 2010 S5 Cabriolet and S4 sedan. Rated 333 horsepower and 325 pound-feet, it's 20 horses shy of the 4.2-liter V-8's power number and its match on twist. We got a quick sampling of the new engine in the cloth-lid S5.Our testing reveals the S5 ragtop is just half a second slower