BMW E30 i6

This straight six is based on BMW's M20B25 (as used in the '83-'94 E30 325I, ). As I still can't really get the turbo's under control (can't prevent sudden peaks of boost, or permanently blowing wastegates) to build a usefull turbocharged engine, I decided to build a N/A one.
Do you guys have any tips on building usefull T/C engines or improving this one?
[EDIT] changed some things to make it more like the real engine (rev1)
Do you guys have any tips on building usefull T/C engines or improving this one?
[EDIT] changed some things to make it more like the real engine (rev1)