Here is what was "caught on the web" on the car connection website. I gueass BMW had to mount a response to the AMG ML 55. Pretty darn sure it will handle as well or close to the M5
http://www.thecarconnection.com/columns/caught/000501_Caught.asp?idSection=02&idCategory=15
http://www.thecarconnection.com/columns/caught/000501_Caught.asp?idSection=02&idCategory=15