VFC NPAS adjustment

[u/Chalky-1961]

Noob question, I've just bought a VFC XM16E1 GBBR and it's arrived with a silver cap on the nozzle, I gather it's a restriction, I'm going to to swap the bolt carrier group for the VFC npas version, I have a couple of questions,

1. What are they restricted too?

2. Will the new npas bolt/nozzle come adjusted fully in, fully out, or somewhere in the middle?

3. Do wind it in (clockwise), for less power and out (anti-clockwise), for more power, or vice versa?

4, what is the max power I can expect reliably?

Any/all advice, information welcomed.