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Well, it looks like a muffler. At least, the top part does. It might be nice to have a real collector in there instead of just dumping the pairs of pipes together, then dumping those two paired flows together. Not sure if there's enough room, though. But how much sound it would muffle, and how well it would flow, I have no idea at all.
I also can't figure out what the lower picture is.
--DD
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