I really need to do something with my injectors on my 98 E300. A few weeks ago I went to install a set of 314 Bosio nozzles. All of the injectors with the original nozzles popped at 135 but swapping to the Bosio nozzles all consistently popped at 90 bar, way too low. I put the original nozzles back for now. Car clatters loudly when idling and will start smoking after idling for a while. In contrast, I just got done putting motor mounts in the former AZ bob E300 and that car is very quiet at idle and no smoke. It is night and day difference. Anyway, I know I have seen it somewhere before, but what thinkness of shim do I need to raise the pressure from 90 bar to 135 bar, or roughly 40-45 bar? The shims on the 603 style injectors are too wide and I see part numbers in the EPC for shims for the 606 injectors in various thickness. If I can determine what size I need I will order 6 of them. Either that, of just get a set of Bosch or Monarch nozzles and hope they stay at the same pop pressure as the currently nozzles. I still could never figure out why the Bosios popped so much lower will all other parts the same.