The Alpha Performance GT-R Air/Oil Separator is designed to remove oil vapor from your VR38's crankcase before it ends up in your intake tubes and combustion chamber. Oil vapor blow-by can have a detrimental effect on your engine - reducing power output and even causing harmful detonation by altering your air/fuel ratio.
Please Note: 2015+ Nismo Edition requires AMS Coolant Expansion Tank for fitment.