World's most powerful roadster? Brabus SV12 S Biturbo

German tuner Brabus has unveiled the "SV12 S Biturbo Roadster" -- a 730 horsepower car based on the Mercedes SL 600. Zero to 60 mph is accomplished in under 4.0 seconds, and 124 mph is reached in just 10.9 seconds. Top speed is limited to 219 mph. The displacement of the twelve-cylinder three-valve engine is increased from 5.5 to 6.3 liters with the help of a billet steel crankshaft, larger cylinder bore, special pistons and piston rods. The conversion also includes re-machining the cylinder heads and fitting them with special camshafts. Foot-wide tires on wheels 17 or 20 inch wheels plant all the power at the rear. Up front, vented and cross-drilled 375x28-mm mega-size discs and 12-piston calipers keep the power under control. Inside, a custom Brabus interior rounds out the package. Gallery after the jump...