The black stuff you see is black hi-temp RTV. I had to use quite a bit because my first generation of collars (which I JB Welded together) ended up being too wide. So I made another set, custom-fitting them to each hose, and riveted those together (smarter move, actually). The new collars ended up being a bit loose in the plenum holes, so I had to close the gaps with RTV gasket maker. That worked pretty well.
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