Sievers delivers a street-legal Mercedes-Benz SLR 722 that packs a powerful punch. In case some of you may have forgotten about the Mercedes-Benz SLR, it was built in conjunction with McLaren Automotive and produced in Woking and Portsmouth, England from 2003 to 2009. The limited-run SLR ran on a supercharged 5.4-liter V8 engine with an output of 617hp and 580lb-ft of torque.German tuning company Sievers figured there had to be more to the SLR 722 than that, and when they appeared at the 2011 Essen Motor Show, they brought out their orange Merc masterpiece. The Mercedes-Benz 722 SLR GTB by Sievers is claimed to be one of the fastest examples in the world, able to reach speeds over 217mph. The engine has been upgraded substantially, putting out 814hp and an estimated 885 lb-ft of torque.