This PCV Delete Kit is a product developed in-house. When installing 3 inch air intakes, this becomes necessary since the air intakes remove the PCV. The 2 K&N filters block the oil deposits that collect in the upper plenum as standard. You can theoretically drive without a PCV Delete Kit but the engine bay will get dirty faster and in the long run an oil smell will be detectable, which will make the experience of 3 inch air intakes miserable.

An installation guide is available here.