Mercedes CLS550 with VRTuned ECU Flash Gains 8mph in the 1/4 Mile VRTuned.com November 14, 2017 Tuning Tech Not a huge amount of enthusiasts realize just how tuner friendly Mercedes’ engines can be. When you think of performance, you probably don’t think of the CLS550 4Matic, one of Mercedes’ largest cars. One of our recent customers, however, showed us how much performance was gained after they came in for a simple ECU Flash ...
