Yeah, the 83-88 Tbirds are oddballs in general these days, and the turbo ones even moreso.
As for the turbo, I know it's an IHI but it's quite small. The 87 model used a T3 turbo which could handle more boost at high RPM, but spooled slow. So in '88, they put in a smaller turbo by IHI which spools quickly. It's hard to hunt down definitive specifications on it though. It runs around 15-18lbs of boost. A common mod is to swap out the IHI for a Garret T3, so I may do that down the road, but for now, the car is a blast to drive and I don't have any plans as far as go-fast parts. It's my DD so I'm trying to practice some self restraint (it's not easy). I've taken it apart down to the turbo itself so I could check for shaft play and any sort of wall gouging (the turbo is still in great shape actually) but that's been it so far.