Baffle should always be on the inlet. The whole point of the catch can is to capture particulate matter and oil vapor/droplet. The purpose of the baffle is to cause a venturi-esque effect where the air is slowed, and particulates contact a surface to collect. "cleaned" air then escapes. This can't occur if a baffle is sitting right at the out/exhaust port.
TL:dr DO NOT switch the inlet/outlet like said above.
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