So, while its a quiet Sunday night and I have time to kill until the block gets back from the shop, I decided to break out the dremel! Bolts came off, one way or another, and then I got to grinding down some sharp transitions between the exhaust manifold outlet and the turbo adapter plate.
(click any photo to embiggen, as usual)
Before porting. Ignore evident exhaust leak. Never could tell over the oil leak...
Oh, btw, this is that nub from earlier I was talking about:
Previously I port matched my 17/22 to the AFN exhaust manifold. In order to figure out which one needed rounding out, I used hot glue as a temporary gasket. Running the numbers from the old ID to the new one for the 17/22, I gained about 20-25% cross sectional area.
Exhaust manifold to adapter:
(the "lips" are caused by the adapter not being seated with all bolts, fyi)
I cannot tell you what the original ID was, though if someone has a spare AFN manifold handy and can measure it, that'd be awesome. Anyhow, the flatter edge you see if where the wall is already thin so I didn't want to go thinner than the majority of the structure.
There is a bit of a lip to catch exhaust to go up the EGR port, but I ground that out too.
As for the adapter to the turbo's hot side