What parts are common/different between the models and years?
There are a host of minor differences between the different year model 924’s and the different year model 931’s. I’m not an authority on those differences, so I will refer you to the http://www.924.org web site and it’s discussion forum at http://www.924Board.org. Use the search function and you’ll turn up tons of information. The 924S is essentially a 944 with a 924 body on it. The “S” uses a 2.5 liter powerplant, and some suspension refinements to set it apart from the earlier model 924 cars. The turbocharged 924, the 931, differs from the normally aspirated model in that it has a turbocharger, a different cylinder head, manifolds and pistons, it uses different fuel injection components, a different transmission and drive tube/shaft. There are a lot of other things that set the 931 apart from the 924, but these are the major points.
