I'm putting new gaskets on the intake valve covers, along with RTV on the common leak points. I'm thinking that for future boost leak tests, I should block off the PCV hose that connects the turbo inlet pipe to the valve cover? As far as I know there isn't anything in there keeping boost pressure out of the cover, which probably isn't designed to withstand boost pressure anyway. I think this would make "boost leak" tests more accurate. Just a thought...