Mercedes R320 CDI remap ?

Interested in buying a certified used vehicle. The 4x4 on these vehicles with the diesel engines looks promising especially with all the snow we've been getting lately. My biggest concern is the performance with a 5000 lb car.

So does anyone know of a remap for this engine State side ? Do not want a performance box but a ECU remap.

http://upsolute.com/ did my E320 CDI but it did not remove the top end limiter.

I have a person here in the area.
It took two trips, first one was to read the ECU and send the info to Upsolute to fit the ECU I have.
I had them do my TDI and ran it for six of the seven years I had the car with no issues at all.

I think you will find that even with 5000 lbs the Benz will move faster than you think.

Plenty of folks have the immotion tune on their 3.0 liter Mercedes Benz in the 07 and 08 Jeep Grand Cherokees and swear them. This is what I will get one day for the wife's 3.0L MB engine in her Jeep GC
http://www.inmotionusa.com/mercedesgraphs.html