[legion]

There are some nice 951 for sale in the Cars for Sale Forums here.

There are a couple of key differences in the various versions/years of the 951. I wouldn't say any one is clearly better.

'86: First year. Most 951s produced this year. Early wheel offset. Forged pistons and connecting rods. 1-piece crossover pipe.

'87: Late wheel offset. Spring timing belt tensioner. 3-piece crossover pipe. Air bags optional. Cast pistons and connecting rods.

'88: Mostly same as '87, but a "Turbo S" was available that year with a bigger turbo. Slower spoolup but more HP. I also think there were some suspension differences.

'89: All 951s were of the 'S' spec.