The clutched variation ?? or is this a standard pully ???
So I'm curious as to why you didn't use the already formed pieces from the charger intake and out let and adapt from there ?? Lesson learned when we did the Del Sol years ago. that housing was cast for better flow to and from the charger. if you go to a flat square to a straight 2.5 pipe your killing yourself on flow. I am glad to see your still coming along with this and hope to see it happen one day.So after drilling and Dremel work, I was able to remove the flange portion of the casted portion of the tubing from the Mercedes.
Now I need to make both sides flat, then make a plate to go over it to then braze that and two ends up bead rolled 2.5" tubing for it to be usable!
I also started cutting the gasket for this yesterday in a Fel-Pro sheet.