[beepbeep]

Sorry for not answering before, I just had a biiiig bussines exam. (covering half semester of studies).

First, it's not ordinary "rebuild by the book" skills that are required for this kind of project. It's more ability to be creative and fabricate stuff. If you have acess to good tools (TIG-welder, machines etc.) it can be dirt cheap. Otherwise you have to go to shops and it will cost more.

Second, supercharger usually cost more, is less reliable, more complicated and nets less power. I've went trough reasons many times before, it's all there in archives.

Third: there is not much "true-factor-turbo-with-extra-cheese" on turbo engine. They were built very conservativly, and have been re-done in many ways since first 930 appeared 1975.

If your SC engine is of low C/R type specced for NA market it will be able to take light boost w/o problem.

Again, I advice against supercharger...this is not V8 and fitting supercharger is troublesome and expensive. There are people here who tried and then swapped it for turbochargers. A small turbo that draws air trough CIS and boosts 0.5 bar, plus little lower control pressure should do the trick.