Greg has done an amazing job re-assembling the car. Very few dramas to report. About three weeks after I picked it up, I took it back to Autosport and he ironed out the last of the bugs. Couldn't be happier.
The new turbo installation also meant that the car needed to be retuned. Yavuz at Unigroup Engineering looked after the car, and I think the results speak for themselves:
Based on airflow meter readings, Yavuz says the turbo can flow up to 250rwkw of air, but at the moment, the exhaust is restricting flow and so he's had to keep the boost conservative to prevent knock. It's most likely the cat restricting flow, so i'll look into extracting that extra potential power down the track.