That would be an electronic boost controller you are talking about. TBH I would get a low KM and clean engine to save $$$ on rebuilding. A D16Y4 with under 100k kms can be had for about $200 these days.

It would be fun with 150kw atw, thats the maximum power the stock rods can take. Boost pressure I would stay below 10psi, but people have pushed further on stock rods.

Join up D-series.org, every 2nd build thread is pretty much turbo lol, lots of good information on there.