MANY members have used the M pump with ultra high horsepower turbo motors... it requires delivery valve replacement, but since you are located on the same continent as the shops that do that stuff, you should have no issue getting SERIOUS power from an M pump.

Diesel Performance Tuning - PeachParts Mercedes ShopForum

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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!