I wish they treated the US like Germany.....
In my Touareg I was able to retrofit the keyless start button Euro OEM Spec. I already had the keyless entry, for some reason they did not let the button come into the United States. A few of my friends who had Touareg's attempted to retrofit the entire system. It ended up being a mess becuase of the complete rewiring required in the car, installation of the modules, the door handles, and reprogramming of the truck. It turned out that it just wasn't worth it. I suspect the ML 350 will be the same way, too many things to attempt. I wish they would offer the same options on the different engine trims. I guess the mentality is that you have to make the owner of the bigger engine feel unique becuase of his choice. I think that is really lame, but I'm glad the 350's don't get the chromed out back where the parking assist is, I think its really ugly and a little overboard.