I found this link to Road and Track magazine where they talk about the C111
http://www.roadandtrack.com/RoadAndTrack/Article/jan2001/0101_salon_mbc111_pg3.html
They mention "tuning" the 3.0 liter turbodiesel to 190 and then 320 hp!!

Just wondering how they did it? Any thoughts?

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Bob Roe
Lehigh Valley PA USA
1973 Olds 88, 1972 MB 280SE, 1978 Datsun 280Z, 1971 Ford T-Bird, 1972 Olds 88, 1983 Nissan Sentra, 1985 Sentra, 1973 230.6, 1990 Acura Integra, 1991 Volvo 940GLE wagon, 1983 300SD, 1984 300SD, 1995 Subaru Legacy L wagon, 2002 Mountaineer, 1991 300TE wagon, 2008 Murano, 2007 R320CDI 4Matic 52K, some Hyundai, 2008 BMW 535xi wagon, all gone... currently
2007 Honda Odyssey Touring, 2014 E350 4matic

They probably had injectors which could deliver more fuel and added a higher capacity turbo for more boost. I have read that the Garett/Air Research turbo on the 617.952 engines is capable of 30psi. I'll bet it had an intercooler to cool the charged air. Although the intercooler won't add power, I'm sure it helped to keep the egt's at acceptable levels.

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2001 Dodge Ram 2500 Cummins Turbo Diesel - 4x4, auto, 3.54 gears, long bed
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'92 300D 2.5 Turbodiesel - sold
'83 300D Turbodiesel - 4 speed manual/2.88 diff - sold
'87 300D Turbodiesel - sold
'82 300D Turbodiesel - sold