[ptbowman]

While I've never looked for it, I doubt you can buy what you suggest here. Unlike Europe, the auto diesel market in the US is small. And then when you multiply that by the small fraction of enthusiasts who would buy a diesel vehicle here (again, totally different market than Europe because of fuel prices here) such as the R class with an interest in tuning it, it probably makes little economic sense to sell aftermarket diesel tuning here of the type you mention. I for one would be interested, but I imagine I would be in a tiny minority.