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The ECS (and several other) catch-can setups have provisions to "vent" back to vacuum, so I don't think the rings are the problem. As I see it, we're introducing volume to the system, but once initial vacuum is built, the added volume is not likely a problem. (I say "not likely" because I haven't tried it myself. there is theoretically a potential for the additional time required to regulate changes in vacuum in the larger volume to create a lag under part-throttle situations?)
For me, the problem with this catch-can is that I couldn't find anyplace to mount it, except in the trunk, and I don't want to do that to my street car.
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