The Prova Subaru Air Oil Separator is a great way to cut down on unwanted oil in the intake track. By reducing the oil that enters the intake track, you will ultimately have a cleaner intake system but more importantly the oil in the intake track if sucked into the motor can induce detonation.
The Prova Air Oil Separator is a different design type and is a great alternative to an oil catch can. Instead of collecting the oil and letting it pool into a can, the Prova system allows this oil blow by to enter back into the oil system directly via the oil fill tube. This eliminates the problem of overfilling your catch can resulting oil starvation issues due to having collected too much oil in your catch can.
Installation is very straight forward. It will work with your factory Subaru Oil Fill tube and your stock PCV System.