Agreed
My old ute made 403rwkw on 98 with only 18psi on a roller dyno so it's doable but it's a manual same as yours which you well know read higher on a dyno
He has the fastest factory-not-factory turbo to not go 250kmh
Edit
Arronm if someone is asking what power a factory turbo makes, you can guarantee they're interested in potential that doesn't required a modified head ffs
If the pieces have locating pins/dowels in the ends it'd be OK, if not then forget about it
It's not the timber strength in question, it's stopping them from slipping apart/off, particularly the top ones