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It would also be visually better if there was a plenum that had a volume between the original largest and the original smallest plenum...
Adding the 2 dowels reduced the volume by 26.5cc, so it's a tad over half the size it was. I was looking for between 25cc and 35cc and...
Yeah I don't think epoxy would be what you'd want to use. Perhaps some JB weld so you can form it the way you would like. Just my two cents