So, a very quick update on this.
I've removed the ECU from the airbox and blocked the hole, amazingly I can definately feel a difference. It feels much smoother than before and makes a little more induction noise.
I've been having issue with a hot side boot pipe popping off under full boost in high gears. It first happend about 3 months ago, but is now doing it almost every other day - resulting in the engine cutting out. I've ordered a few new parts to bolt on (hopewfully tomorrow).
These to replace the 90degree silicone bends as they rub slightly on the radiator brackets (sticking with black to remain 'stealth')
And have these coming next week. The intake pipe is 3" instead of the OE pipe that goes down to 2.16" at one point, and the intercooler pipework in 2.5" instead of the OE 2.0".
Then early next year I want this exhaust system, it's apparently one of the quietest stainless systems and is only slightly louder than OE.
With all the above done I should be at around 310bhp and 370 lb-ft. I'll get it back on the rollers early in the new year to see how it's doing.