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You read my mind.
The turbine houseing is coming off for sure for slag blasting and will at least get ceramic coating on the out side. I will be putting dremal to torus, but how far I go with it is unknown. I have a good set of cast iron porting tools so working and finishing cast iron is no issue for me.
In standard non VGT turbos smoothing the torus is pretty common because you have exhaust gas moving at about mach 2 along a rough cast iron surface during high power load. Smothng out the torus gives more boost with less back pressure, win-win.
I am also going to smooth and widen some of the turbo manifold near the outlet. My friend tells me that turbo looks to be a T4 flange and the manifold is a T3. I could buy an adapter but I think I will make my own.
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