Dodge did this for emissions and emissions only. WAYYY back in the day (like before any of us were around) there used to be little tubes that would just let this condensed oil drip onto the ground as needed, but that's not something anyone can do anymore.
What this setup does is put a two chamber can in line between the PCV valve and the throttle body. The top chamber, where both hoses connect, has a filament inside similar to steel wool. The steel wool allows the vapors to condense and then drop down into the second chamber (that you see me holding) for collection.
I figured this was a joke until seeing pics of an LX Hemi opened up for a cam/head swap and all the oil everywhere it shouldn't be. I ordered one, installed it, and instantly picked up a hand calculated .5 mpg increase and the comfort of knowing that my truck is no longer breathing it's own oil.
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