Renntech has been known for performing great work on Mercedes-Benz
, and with their take on the CLS63 AMG, they stepped their game up to another level and pitted it against the notorious 2012 Nissan GT-R
on the drag strip. The 2012 Mercedes CLS63 AMG runs on a 5.5-liter twin-turbocharged V8 that packs a serious output of 518hp and 516lb-ft of torque. Renntech then added a new exhaust system and an effective ECU software upgrade for a seriously boosted output of 669hp and 734lb-ft of torque.