Perrin Air Oil Separator KitThe PERRIN Air Oil Separator traps oil from the crank case vents before it enters the intake, reduces carbon build up, increases intercooler efficiency, which reduces the chance of performance robbing detonation. Not a catch can The PERRIN Air Oil Separator is not a catch can. Catch cans capture engine blow by and stores it in a container, which requires constant attention and removal of oil every few hundred miles. The air oil separator separates the