"I had a friend block the exhaust off, and the car had a steady leak from the wastegate area"
If the wastegate is stuck open it would not created boost BUT it will not cause an exhaust leak, the exhaust gas would just go around the turbine wheel and out the O2 housing, downpipe etc.
If you are getting an exhaust leak then I'm afraid you have either a blown turbo to manifold gasket or a cracked turbine housing. Or since you said you bought it like this correct? The idiot that worked on it last could have broken a stud or stripped the threads on a stud causing it to leak.
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