Yeah the turbo dump was a little loose.
We did them and checked the turbo bolts but they seemed fine.
Took it for a spin and it was boosting fairly well.
2nd gear seems to make boost different to when in 3rd which I didn't think was possible.
On the way to work it still managed to whistle again at around the same vacume.
Not sure if related but I cleaned the AAC and put that back on plugged it all back in and no matter what I do the car idles at 1500rpm unless I unplug it