Well, the normally aspirated engines run at a compression of about 10.5:1, which is far above that of the turbo models, which run at around 8.5:1. I could be slightly off here with the exact numbers... Of course, when you use a turbo on an engine that already has high cylinder compression, you'll get things like blowby, cracks in the head, etc.
I say don't do it. The turbo 9000s have all kinds of electronic gadgets to both save the engine, and provide peak performance. You would need a donor car for all the parts it would require!