The first thing that comes to mind is a blocked boost signal line to the ALDA. Consistent with that would be absolutely no smoke behind the vehicle on hard acceleration.

If you get lots of smoke and no power, then there may be a serious issue, like low compression, bad turbo or something. I wonder if a turbo ever gets bad enough to seize, or if it just gets really loud and squealy? If it seized, I would think that would really kill performance big time.

Ken300D