Ha, nother truck guy! LOL, theres not a whole lot we can do to them without going all out. The Bosch MW-pump on these is crap for performance. The only decent option is to send a euro M-pump to Myna Diesel in Finland. I have sent an e-mail to CDS to inquire if they can do anything.
The Fin's have got the OM617 5cyl over 400hp iirc EDIT: SEE ABOVE POST
Good mods are to get it in perfect running condition stock, then max out what little pump adustments are avalible, add an intercooler and a VVT turbo and go!