Sylvester Stallone. The name conjures images of flying fists, epic training montages, and, of course, fast cars. But what rides does Sly cruise in when the cameras stop rolling? Buckle up, gearheads, ...

The 3.5L EcoBoost engine has been around long enough that there are several performance upgrades owners can choose from. Here ...

The RS6 becomes an all-electric speed demon, while the RS7 morphs into a plug-in-hybrid twin-turbo V6 mile-eater ...