If you call NZ Performance, They'll tell you, and they'll probably give you different hats for the injectors because I believe the new x range of ID's are slightly shorter (for our stock rails anyway)? Anyway, just call Paul @ NZ performance and he'll help you.
If you're aiming for something above 240-250kw, don't waste your time with a FMIC unless you really don't like front mounts or just like spending money. Lots of expense with minimal returns imho.
Aeromotive Fuel pressure regulator. Don't skimp.
Your exhaust may or may not fit with that turbo. /me shrugs. If you've got a 2.75-3" you'll not need an upgrade.
As for your boost control, you should really be using your boost controller with the link. Not standalone, so I'd suggest changing that if possible. If you're changing boost after you've had a tune, then you're asking for a blown motor anyway. So just run it through the link.