M pump is more easily modified. It was also used on the om60X line. I could drive my NA euro at 110mph all day. My NA Fed was like 95 max with needle buried.

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http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42