Tapping PCV hole on MP Perf. Valve Covers..

The air cleaner, as pictured above, is a MoPar part, repro part of the HP un-silenced air cleaner I believe. As they are an OE part, the breather on the cleaner is stock.

MoPar also sells it in chrome with and without the breather tube. Most people like myself like the black wrinkle. But it doesn't come without the tube, only with the tube.

The bennifit to a breather to is to create a vacuum so the burning oil thats making smoke gets sucked up into the breather keeping the engine cleaner inside.
This vacuuming of the inside also relieves pressure that can result in gasket blow out if left unvented. (Sealed) A simple vent on top is a min. to have IMO, though not a mandotory item to run.