I don't disagree with your comment B-Line...the tech and i did discuss if the M's could handle it. He brought up the E53 LeMans V12 and how BMW did some modifications but in general the E53 frame handled the excess power with ease. He mentioned that that if unleashed, the M's were designed to handle the power and then some. He kept repeating that the M's being de-tuned was simply a safety measure but that true enthusiasts always discover a work-around to unleash any performance BMW's true potential.

I was impressed with his knowledge of the X5's in particular my 4.6iS.