Damn, that really sucks. Manitou - box looks great! well thought out and executed.
Wastegates were serviceable, but barely. I had to fight the piss out of them, spent from 945pm to 135am just to get those little buggers in there. Clearances between the wastegates were the true problem. My car is REALLY noisy. Not motor noise. Exhaust / tinging from bottom of engine. Not knocking to the best of my knowledge, and when I was priming it, there wasn't any issue. The motor itself appears quite quiet really, but I think I need to re tighten everything down now that it has heat cycled a few times.