It looks like your Forry will be seriously transformed after this week, I'm sure you'll love it.
Probably too late but I would ask the guys at Evo R if they've got any old stuffed VF22s lying around and smash the P20 rear housing on your VF34. There is a very good chance you will have boost creep issues with the P18 housing on the 2.5L. Check specifically that the entry into the wastegate port from inside the exhaust housing is rounded and smooth instead of being a sharp edge as this is what causes the boost creep issues. From memory the P20 housings already come with this edge smoothed.