Anything would have to be custom made as thiers not any thing out there for the 3.3. Grand Prixs back then had a 3.1 w/ turbo but it would need modified with custom headers, all the turbo tubing, intercooler. Then finding someone to tune it so it will run other wise it is not going to work like a plug and play thing.
Very expensive too if you cant do the work your self. I have a 3.3 from 95 thats turbo, I had it in a 93 GA. It had been bored out and running around 12-14psi.
This was a kinda class project from me and some Linconl tech students back in 95'. I ended up totalling the car but the engine was saved, and not for sale
In the long run it would probly be cheaper to just go buy a turbo car or a Super charged GTP
Good Hunting!