Well Those are interesting photos that just proves the point that it's poorly manufactured. And what would worry me is if some of that casting flash breaks off and gets digested in the engine you can just kissed you engine good by.
If they had been smart when they design this they would have made it 2 pieces, with a removable cover which would have allowed you to get into the plenums and clean up the runners.
It's just a bad deal no matter how you look at.
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