Mercedes CLS550 4.7L Bi-Turbo ECU Dyno Test VRTuned.com December 28, 2015 Product Info, Tuning Tech We had a chance to test out our VR Tuned ECU Flash on this 2012 Mercedes CLS550. The 550 features the 4.7L V8 Bi-Turbo that makes 402 horsepower. On our Mustang All Wheel Drive Dyno with 91 octane, this...
