I have to ask this question; I can't seem to find a straight answer on the board.

There may be a 603 swap in the future for my W123 - after weighing the cost of a Myna pump and other performance mods.

Newer engine technology may also yield better economy results. Doesn't a OM606 get around 30MPG and have well over 150+HP, stock?

Not that I really want to deal with a computer controlled engine, but a 606 does sound nice. (WAY out of budget! )

In lieu of that thought, I would like to know.. what can a 603 yield as far as power and economy?

Also, what transmissions were available? Any manual gearboxes?

Can some of these great innovations such as variable geometry turbos (VGT) be fitted to them? Two stage injectors? Intercooling? What modifications can be made to the fuel delivery system to provide more fuel?

Things like that, any input appreciated. Just.. anything short of sending it to Finland.

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Vehicles:
2002 SLK 230
Gone but not forgotten:
1983 300D
1981 El Camino 'OILBRNR' - 6.2L diesel
OM617 powered '86 F150
1984 BMW 524td
2001 VW Beetle TDI
1994 Sunurban 4x4 6.5L diesel