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A few updates. The Spectre brand silicone adapter is from Advance not AutoZone. The silver heat shield material is from one of my dad and uncle's race car projects, and is expensive. If I were doing this from scratch, I would probably use thin aluminum like what lines the transmission tunnels of most modern cars these days. I would think it would be fairly inexpensive at a wrecking yard. Also the elbow is fastened to the box with machine screws and nuts, the silicone is only used to seal the seam.
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