It’s 5 and a bisected anxiety long. It weighs 8.8 pounds. Height of an developed female, weight of a gallon or so of gas—these are the analytical ambit of the carbon-fiber driveshaft active amid the engine and the rear-mounted transaxle in the new Mercedes SLS AMG. We agenda this actuality because, admitting the car’s retro-gullwing looks, the SLS is absolutely bleeding edge—both in agreement of its abstruse attributes and what it represents for Mercedes’ centralized tuner. It is not artlessly a Mercedes with bigger auto and a breathed-upon V-8 or V-12. It is, down to its churning carbon-fiber core, AMG’s aboriginal committed auto and the actual antipode of the ever circuitous and ample half-million-dollar Mercedes SLR McLaren.