High Performance RB N54 External PCV KitThe RB N54 External PCV Kit is the original Low Side system originally developed in 2015, thus it has many years of usage and acceptance from dedicated N54 enthusiasts. This product we have found does wonders in eliminating vulnerabilities in the OEM PCV system, beyond that of what only a simple Internal PCV Valve replacement can accomplish. With high performance always comes finding a systems weak links, and when you combine that with component