I think the pump will be able to make the pressure and since it is a positive displacement type pump, the time for the fluid to reach 135 bar instead of 115 bar is probably negligible. Long term it might not be ok for the injection pump, as the (less than 20%)higher loading on the parts may wear things out sooner.

In all likelihood the vehicle will run, and possibly a little better due to the better fuel atomization and shorter duration injection event (more time to burn the fuel). One of the features of the new CDI systems is a very high fuel pressure in the "common rail" so the spray pattern is more consistent for each injector, and also between injectors (they all see exactly the same pressure, theoretically). Additionally the duration of the injection event can now be controlled, as it takes less time to get the fuel in there, which leaves more time to burn the fuel, or as MB has elected to use the time, they can vary the injection rate by throttling the injector. They use this feature to get a little initial squirt burning, and then spray the rest of the fuel into a burning flame front. Gives lower noise and much better emissions and economy.

So, before I would put those injectors in the head, I would check to see what the max design output pressure of the pump is. I have no data to give you here, but I am sure if you check with a Bosch injection pump service facility they can advise you.

Good luck, hope this helps, and if you elect to do this keep us informed. Jim

__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)