Do you know what tuner you are going to use? It seems as though some of the well sought after tuners of years past are not offering tunes anymore. Perhaps they are but aren't listing them? Either way there are still many others available.

I too am interested in an answer as I will be getting a tune at some point for my new to me CDI. I want that EGR gone, it smokes out people any time I downshift and it makes me angry...I have a tuned 603 that doesn't smoke at all!

If you are willing, it seems an upgraded intercooler will allow you to make the most of a tune as the stock one is inadequate for much more than stock power.

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Dan
2005 E320 CDI - 246k
1987 300SDL TD05-16g, Herlevi pump, Elbe manifold, 2.47 LSD - 213k
Past: 1987 300D - 264k