I haven't been on here in months so here's an update on my car.
From the top:
Finally my car was retuned by Matt... no more boost cutting since the retune but occasional boost spikes to 20psi.
I went to a charity dyno day and my run resulted in a 148.4kw@164kph and 320nm@98kph max boost was weirdly 14psi when the car is tuned to 17.4psi and before/after the run this was confirmed.... must have hooked it all up wrong. This particular dyno is known to read around 10kw lower... Very happy with this result anyway.
Found boost leak/fixed.
hooked up my intercooler water spray kit which I actually believe makes a difference in these hot days. After spraying, boost feels smooth with no hesitating.
Im getting some ku31 tyres tomorrow - yay
My GT wagon now has 240,000km going stong