In the early part of this century, we had a member with a turboed 85GT with otherwise stock 2.8. He was using the 85GT ECM. I rode with him coming back from Franklin, and it was no slouch. I seem to remember he said it was about 190 HP. It was his daily driver, too. I have no idea who burned his chip.
Was that Bill? Had the red 85 GT?
If I remember correctly, it also had a "piggyback tuner" that accommodated the changes that the turbo made. I talked with him a while back. He said he was having issues with it. Thought it was a MAP sensor. I've tried to contact him several times since then, with little success.
Nelson has a turbo'd 3.4 in one of his Meras. It certainly is no slouch. I'm not sure who did his chip, either.
I would be inclined to contact Ryan Gick, at Sinister Performance. (gmtuners.com)