The Mercedes CLS550 M278 engine is huge power plant for the large sporty sedan. The 4.663 liter V8 Bi-Turbo engine produces 402 bhp while matched with a 7 speed automatic transmission. Driving this car feels much smaller inside than it really is, but once you get on the throttle, the quick turbo spool and 443 ft/lbs of torque rockets you ahead. The CLS550 can make huge headway in power with just a ECU Tune. The VR Tuned ECU Flash takes the sedan to 530 bhp which is immediately noticed upon driving it. The ECU does require it to be removed to be bench flashed. Conveniently Mercedes but the ECU right on top of the engine so it literally takes 5 mins to remove. Tuning involves changing Boost, Fuel, Timing maps to prove better acceleration, faster throttle response, quicker turbo spool, and more power all the way to redline. Check out our local Arizona customers matte white and black wrapped CLS550 that we did. Ready to get your Mercedes CLS550 Tuned, Go Here! Leave a Reply Cancel ReplyYou must be logged in to post a comment.