Audi R8 V-10

What’s better than a top-of-the-line, $161,000 2011 Audi R8 Spyder 5.2 FSI Quattro? A supercharged version making over 700 horsepower. And what can possibly top that? One with a full warranty, of course. The heart of Stasis Engineering’s Challenge Extreme Edition R8 is a bolt-on Roots-type supercharger (running at 7.5 psi) that adds another 185 horses and 132 pound-feet of twist to the 5.2-