It's been discovered time and time again that the factory EFR Bypass Valve can leak under extreme conditions. It's also a bit tough to run plumbing in all scenarios (much like our NC turbo kit with the alternator in the way). The Full-Race EFR BOV is CNC machined from 6061-T6 aluminum and Hard-Anodized for lasting good looks. There are two big benefits of this aluminum design. First is improved strength compared to the stock plastic EFR cover plate. Second is an adjustable 90 degree barb fitting making it easy to fit and plumb in tight space constraint installations.