there have been a lot of stock y8's running 10psi daily. If you want to go more than that, I'd recommend doing at least rods and pistons. I would also recommend getting head studs. I built the hell out of my D, and I'll be running 15-20 lbs daily. I also spent about $1200 on engine management...
Believe me, you can't just throw a turbo on your car, make it fast, and not expect to blow it up. I have boosted 3 different motors in my daily drivers, and never blown one. But I've taken my time, researched a lot, and know what not to do. REsearch is your best friend.
www.turbod16.com and www.homemadeturbo.com are a big help. On HTM's forum, there is a long thread about engine managemnt, and what you CAN get, and what will help your engine last.