if you have to go to macleod, then you will have to take somethings off. EBC definitely. Intercooler is fine providing your airbox is standard (one intake mod allowed). If your turbo looks stock and running stock boost you should be fine. Piggy back I think is a no no. Not sure if they can check the bigger injectors but then again, i Dont know how well it would run on stock ECU.
Dont quote me on any of this, but last time I went to Macleod, i got the full inspection which included noise, emissions etc. They even plugged into the consult to check if my ECU was standard.