Heh, Vidar's **** is so strong you can smell it from here.
That S38 is a killer and Scandinavians are turbo animals, especially that other e34 with the three-mile long intake manifold (similar to Vidal's) that Erich introduced us to a few months back.
If you take an M30 and add those sick 2-metre diameter Scandinavian turbos they use, setup the Autronic, injectors and so on, you end up with some seriously sick ****. I will definately be hunting around for a first time look at this stuff, next time I go North...
Problem is, I always thought that if one built a motor like that, taking so much time and effort to check and recheck, calculate and over-calculate, build and re-build, etc. - how do you ever know how much boost/NO2 & etcetera you can add? Where does one stop? Sure the shafts or the diff will go first in most cases; but ultimately with a tubbed 9" rear such horsepower is just an exercise merely to see what can be done, let alone and one that will likely come apart in the process (spoiling everything).
I've seen that happen too often- and invariably the builder often just goes on to another project. Are you really prepared to do this? Be sure you are it will take more than time, money and effort.
I know I am just me, but I am happy that these motors go well enough in the real world... and have potential. I am keener than most to check this stuff out and swoon, but is it really worth it for you to do all this just to push an M30 to a desired output figure? Why do such a thing- what is your driving interest in it? And how will you work out where to stop without blowing it all sky-high?

Nick