BWAHAHAHAHAA!!! Just took it for a test drive. Well, two actually. First one SUCKED. Seems as though when the turbo and exhaust were installed, the WG actuator was never hooked to the arm, so I had no boost (and a rather odd exhaust note). Came back, found that, fixed it, and test drive two ensued.
Response was much better, the motor is BUTTERY smooth at anything off idle, idle's a bit rough yet. ECU's are learning, engine's still a little tight. Kept it below 4k, WG is running 6-7psi, and it just feels SOO light on it's feet. Response to throttle input is immediate, spool is quick (though it's severely lacking top-end with only 7psi). Vacuum is ROCK SOLID at 16" at 800rpm (no flutter like the tired 530 or the 531 after the MS screwed it up), oil pressure is 30psi at hot idle, 60 at cold idle, 50 at 2k hot, 60 at 2k cold. With the SAM HD mount on the right (B20 mount on the left since SAM sent the wrong left side mount - 240 set instead of 740 set), it's got a little more vibration than the hydro's had, but there is NO motor movement at all. Rev the throttle and the engine moves MAYBE 1/4" without the ratchet strap!
Now to drive it and wait for the miles to add up so I can start adding boost back in....