[Zero10]

In 87, the 2.7L was available too, other than that, the 2.5L in the 944's is the same as the 2.5L in the 924S. Except perhaps the fuel rail configuration. I believe the 924S used the later DME, and therefore had the second temp sensor.

Now, about the turbo part.... that's something that seems to come up every 3 or 4 weeks, and it never gets a warm reception.

Long story short, buy a turbo.

small typo, I think you mean 87 944 turbo.

You also need to remember, there is a lot more to a turbo than the engine, suspension, fuel pump, and probably a dozen other things I've forgotten about.

You would also need a full set of heat shields.

Correct me if I'm wrong, but I believe the nose panel on the 924S is welded into place, just like the early 944's. Which means you'll have a tough time getting the intercooler in.