Well, you could get a pre-cat exhaust, I think, and pre-emissions camshafts, but altering the timing advance curve and mixture control is going to be a real pain -- if that has K-Jet, parts are not going to be available for a non-emissions control system, they didn't exist.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!