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Race Mode (butt dyno tells me that the throttle is faster to respond, faster shifts and seems to be generally quicker than sports+). This is all antidotal, until I test it with RaceBox.
Intelligent Light Mode (MB voodoo that would get me burned at the stake in the 1600's. Well worth it.)
I tried some simple and safe testing to see if there is anything noticeable with moving between Sports+ and Race modes. Holding speed in Sports+ and switching on the fly to Race changes RPM and gears. It also appears to remap the air/fuel. The car is noticeably quicker. The drop to the lower gear is faster the shifts in-between gears is faster and the 'sweet' spot in the 2 / 3 gear pulls are different between Sports+ and Race. It also holds the gear when you let off the accelerator and won't drop a gear like Sports+ does after a few mph reduction.
I'd like to get to an open and unused road to test 0-60 and 1/4 times with the RaceBox to see if its is faster in time and trap. I do not know if the top speed limiter is removed. I don't have a way to legally and safely test top speed. So if anyone has experience with this, please chime in. It is definitely worth having this added to the E53.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
