Respdoc,
I really would like to see a few owners give this a shot. I can't even think about it until I graduate (or win the lottery, whichever comes first). I really don't see this as being too much of a difficult task. I wouldn't try it myself but I know a few MB tuners that I could commission for such an undertaking.

One thing xfire owners are missing out on is performance. There aren't too many owners out there who are really trying to tune these cars (notice I didn't say zero). The owners that are out there working on these engines tend to stay in their own world and keep their research to themselves. That is something the community is missing. Every other car I've owned (PT, SRT-4, DSM Laser) has had a performance orientated crowd. I really miss that group...