Brabus 700 Biturbo

Brabus has taken the 6.2-liter SLS AMG V8 and attached a pair of turbochargers to the already-excellent mill. Output has gone from 563 horsepower and 479 pound-feet of torque, up to 700-hp and 626 lb-ft of torque. Brabus has also gone ahead and changed the intake and exhaust manifolds, engine mapping and exhaust system on the Mercedes-Benz flagship.

In fact, Brabus has gotten down to the nitty-gritty with its 700 Biturbo at the Geneva Motor Show. Traditionally, twin-turbocharged engines have a pair of turbos both spinning in the same direction. Brabus has fitted a right-turning and left-turning exhaust to the respective sides of the engine, and this allows for optimal air flow into the engine.

All of this work has produced a luxurious grand tourer that hits 0-62 miles per hour in 3.7 seconds, and can run on to top speed of 213 mph. Brabus has managed to do all of this without slapping on eye-searing paint an ill-advised body kit. 

2012 Mercedes-Benz C63 AMG

The 2012 C63 AMG has the same 451-horsepowerc under the hood, though an optional AMG Development Package can crank that figure all the way up to 481 ponies. Bolted behind that miracle mill is the company's seven-speed AMG Speedshift gearbox, though the transmission now comes with new mapping to squeeze as much efficiency as possible from the drivetrain. Mercedes-Benz calls the mode "controlled efficiency," and along with a new, more efficient power steering pump, the company says that the 2012 C63 AMG will boast a 10 percent nudge in fuel economy over its predecessor.

EPA figures are still pending, but Mercedes-Benz says that the sedan will clip off the 0-60 dash in 4.3 seconds with the optional performance kit. With acceleration like that, who needs fuel economy?

The Silver Arrow has also been kind enough to include a handful of aesthetic tweaks, including a redesigned grille, lower apron and daytime running lights that were heavily influenced by the company's SLS AMG. Inside, a new dash and LCD screen dominate the conversation, though a new three-spoke tiller is also part of the package.