Hello guys
I have a few questions.
It was my big wish to put turbo engine in my 1983 bmw 635csi as my m30b34 engine was already replaced back in the days when previous owner blown it.
I was lucky enough few weeks ago that I got a good deal on M106 engine from an 1983 e23 745.
Since I need to refurbish whole engine as I don’t want to repair stuff later and my goal is to get at least 500hp out of it.. I dont race or drive track days. I just enjoy the car in summer when it sunny day as a daily. Otherwise I have othe car.
So since engine is in pieces now. What should I replace to acchive 500hp?
I already bought APR head bolts.

I know I will need to replace pistons. Any recommendation?
Also head gasket needs to be better I assume.
I was trying to find any topics on forum from someone who build the engine but without any luck..

The engine cane without ecu but I have completr engine harnes. So I was thinking standalone..

If someone can point me in right direction or have any links to the topics where is written something please let me know

Thanks