You must be mad to think of tuning a car which is already tuned to the max! But Danish tuner Kleemann is mad enough to fiddle with it and give it another 50hp! The engine they are working on develops 720hp and 1150 Nm of torque.
The standard Sl65 Black with only! 670 hp can do 0-60 in 3.7 seconds and tops as near as makes no difference 200+ mph. So the Kleemann monster should be able to better these figures, but the fact is 0.2 seconds better acceleration or another 5mph faster will cost you a heck of a lot more money, so honestly not worth it. I can live with only 670hp! Official details are not yet revealed.