M45 Air Oil Separator Red w/ Black Fittings 2002-2007 WRX / 2004-2021 STI

This is the M45 Air Oil Separator Kit. This kit has been designed to trap harmful oil vapors from entering your intake system. This is a great solution for those of you who want to prolong the life and performance of your engine so that you can run at peak efficiency without the effects of oil vapors harming your octane rating, causing detonation issues, or other harmful effects of oil and vapors entering your intake system.