2006 Audi S4

In addition to its six-spoke Avus-style wheels and low-profile running shoes, the S4's visual threat is enhanced with more aggressive grille work up front and larger dual exhausts out back. Polished aluminum side-mirror housings are Audi's polite way of saying, "Out of the way, Jack!" Out of respect for the unwritten law that insists that every automobile with sporting intentions must have a deck-lid spoiler, there's one on the S4 sedan's rump. At least it's discreet.