boosting an sc400...

okay, im selling my subaru soon, and i found a nice cheap sc400 that im considering either nitrous-ing or turboing. how much boost will the stock internals take, and what supporting mods will i need to run that boost?

here is some very vital info:
http://www.clublexus.com/forums/showthread.php?s=&threadid=63202

here's more
http://www.clublexus.com/forums/showthread.php?s=&threadid=63871#newpost

thanks for the info