I have a 1981 300D {W123} non turbo...what are the chances of making it a turbo w/later turbo manifolds{1982- 1985} Thanx

not a good idea. the turbo motor got an upgraded oil pump, and drive, hardened valve seats, sodium filled valves, and oil squirters on the pistons for cooling, and a hardened crank...
very bad for the motor to just turbo it. you'd also need to get a turbo IP and plumb in the ALDA for boost control of fuel... best to get an actual turbo motor and swap it in if you want more performance, but then you should swap the tranny and the diferential and the speedometer... just get a turbo car, it's easier......

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Welcome aboard.
Do a search, your question has been discussed many times. You can do it but you can kiss the longevity of the pistons goodbye.

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Jim

if its just a rally car...

experiment, and intercool it..

then drop in a turbo engine if that one fails..

if its a rally car