I saw a turbo Lude running around VA Beach with the plates "XTRAPSI". I also know of a turbo 'Lude owned by a guy in Mi-4. He posts on this forum.

As far as boost pressure goes, I know the Greddy kit runs at about 7-8psi. They use the same TD05H-18G turbo on the Prelude kit as on the Civic Si/Integra GS-R. I would be sketchy about running any more boost than that without building a fuel system that could handle it.