If you want a fast diesel, take an OM617, add an alloy head, throw an intercooler into the fray, turn up the IP, adjust the boost, and you can get 230 hp. About the same as the new C30 CDI AMG over in Europe.
That's what Mercedes did back in the '70's. And that setup was considered going into production.
On the third generation C111, Mercedes clocked speeds in excess of 200 mph with that diesel.
Do a search and you'll find more info on what I mean.