Witness a battle between two giants! The Mercedes SLS AMG Black and the Porsche 911 GT2 RS battle it out on the race track. Here are a few details. Over the years, the Porsche 911 GT2 earned the nickname "The Widow maker". This is the "RS" version of the thing. It comes with a rather unassuming 3.6 liter six-cylinder boxer engine that comes with two turbochargers, and 620 hp. The 911 GT2 RS needs just 3.5 seconds to get to 62 mph (100 km/h) and it tops at 300 km/h. At this point you'd say "Yeah, well, yet another supercar...", and you'll be wrong. Take into account the fact that it's rear-wheel-drive, and that its engine is actually on the back. Now that ditch doesn't seem so far away anymore, does it? On the other side of the battle field there’s a 622 hp Mercedes SLS AMG. The Black comes with a much larger 6.3-liter V8 engine and a little bit more common sense. Even though its engine is at the front, the SLS AMG Black is just as much of a beast as the 911.