Well, there is no "Boost" map in the bin, and there is no direct control to target boost. You are looking for the Target Load Setpoint and the TCV Duty Cycle Pilot Control maps. Here are those maps in my T5 tune with a 16T. https://turbochuckcom.ipage.com/webimages/projects/97%20Volvo%2085...

Another thing, is that my 855 is from Europe, probably the bin isn't the same. Does anyone have a base file for a European 855? Thanks very much! I've been changing the Target Load Setpoint and it doesn’t seem like it’s doing anything. Am I missing another map or limiter that could be capping the l...

That chip isn't a needed item. Not sure what it is, but it's not on a few of the turbo boards I've looked at.

There should be no problem with mod the board you have. They're surface mount components, and there is already solder on the pads on the board.

Can you post a pic of the label from the ECU?