I work with a guy who owns a performance shop and he will do turbos on 22RE's and get about 9 pounds of boost out of them.  Granted he really knows what he is doing.  He just offered to turbo mine with a turbo off of a supra, he would build a custom header, intercooler and intake.   He told me I could probably run about 9 pounds of boost.  He said he would do it for me for 1000 dollars, too bad I have a baby on the way and can't do it, but any one from the Portland Vancouver WA area let me know  and I will hook you up for about the same deal maybe 1200  at most.