Think carefully about ECU. This is the right time to decide which way before wiring!!
Might add additional costs at this stage from a standard one, but has a whole host of advantages. Like data logging and diags without the need for a VAGCOM, boost control. Even cones with a vase map for engine. Will need a manual throttle body and accelerator cable run.
Not sure on how much boost the k04s can take from standard 7psi. But with after market, can change via ECU instead of going manual boost controller. I'm running 19 psi with the T28. Limit I've been told is 23. Getting the courage this year to try it. Already done boost map. Just need to download it and try!! Needs a rolling road check up so might wait until then.
Have a look here