Stock turbo is T3 with a 55 trim .42 A/R 60mm compressor and a .48 A/R turbine housing, Cosworth style but not as nice as the real deal.
There is some restriction in the tube to the compressor, alongside the block. Also found an air leak there, the arrangement with the O-rings can be troublesome.
I'd:
-Ditch the balance shafts and plug the feeds/drains. Airbox mod.
-Increase boost via the mod Ipdown did. Maybe a tad more wastegate tension or experiment with different actuator, worked for us.
-Better exhaust (DP is already 2.75" and good material so I would leave it alone)
-Later on, something like a T3 Cosworth with 69 mm compressor. Fits almost like stock. Or something more modern. Of course that turbo can move 350+ hp worth of air so this wont spool with everything stock in the EMS side and supporting mods like better IC (id save up for a drop in one from do88), more fuel yadda yadda. A set of H-beam rods would be nice too then considering the low price.
The B204FT/GT my brother has in his '82 760, with the above things and for now a T3 Cosworth 60 trim 60mm compressor and .63 A/R turbine, some more boost, 3" exhaust, I forgot what we did with the chip (drove around with Ostrich and changed stuff), light flywheel+M90. Goes nicely, not many extra's so its a light chassis compared to a 960. Good enough to annoy some good modern cars. 80-120 in 3.5-ish seconds.
Next summer GT3071R so more better next year.