Welly

Disregard boost control question, tracked down a very useful article here: https://cobbtuning.atlassian.net/wiki/spaces/PRS/pages/615088215/How+Subaru+s+Factory+Boost+Control+System+Works

Hi all, first post and new to the forum so apologies if this isn't in the right place. Been doing modifications for a very long time indeed, however, totally new to the Subaru boxer and looking for guidance. In the process of replacing my Brother's turbo on his 2003 WRX which I believe is a PPP model (not sure how to confirm however). The turbo extracted is a TD04, and certainly has thrust bearing play and needs attention. We have to go on in it's place a good condition VF35. Simple enough swap, however, I have some concerns with regards to fuelling, especially as I have no idea what the WRX PPP stock injectors or pump are, or capable of. Fuelling and a map will come at a later date, but for now this need to be 'safe' (word used cautiously) on stock pump and injectors. What's the score here? Also, how is boost controlled on these engines? Can't see that there is any kind of solenoid for controlling boost, and the actuator is piped to the boost outlet nipple with a T off to what I assume is a MAP sensor. Seems that the wastegate is the control mechanism?