The CFM oil separator is an inline filter which separates oil drawn through the PCV system before it can enter the intake manifold. When oil enters the intake manifold it is ingested into the engine creating harmful oil deposits which can lead to bad fuel economy, degrade octane of fuel and/or detonation. An oil separator should be mandatory for any application with forced induction but will also work well on naturally aspirated setups. Kit features all necessary hardware and bracket for an easy install in your Focus. Removable plastic bowl allows for easy cleaning.