The Mercedes-Benz G-Class is the definition of a rolling brick, but that doesn't mean it can't go fast, as Benz's AMG division has already proven with the G55 AMG. Apparently, German tuning house Brabus -- who specializes in making already stupid fast Benz cars and SUVs even faster and more exclusive - decided the G55 wasn't fast enough. So Brabus shoehorned its most powerful M-B derived engine -- the 700-hp 6.3L V-12 biturbo -- into the G-Class. Who are we to disagree?  If owners can keep the tires from melting (literally), 62 mph comes in a scant 4.3 sec before hitting a limited 150 mph top speed. Forget about entering the corners, because despite the tuned running gear, the G V12 is still a top-heavy behemoth, but a stupid fast one. Oh, and it costs about $480,000 if you were wondering.