Plenty of people run cracked VF* turbos and they hold boost fine. Still though, this is far from perfect, I'd be pissed for seller not mentioning the crack -- it's pretty big, he'd be blind (like, "not allowed to drive legally" blind) not to notice it.
really! is up with Impreza peeps not selling stuff as advertised lately? Bad enough they don't wave.. Lamerz.
Stan