[klhansen]

It may be totally unrelated to your turbo pedestal and EBPV delete. There are plugs on the front and back of each head that seal the HP oil galleries. They're sealed by o-rings and if one of those let go, it would cause a pretty good HP oil leak. The ones in the back of the heads are a PITA to get at, so of course, those are the ones that leak.

 

[klhansen]

If you're dumping oil out thru the exhaust, about the only place it can originate from is the turbo bearing seal.
But that being said, oil can wind up in places you don't expect. Those HP oil plugs I mentioned could spray oil on the outside of the exhaust.