•Actively Regulates Lash Adjuster Supply Pressure to a Constant 15psi•Reduces Oil Flow Into the Head, Keeps More Oil in the Pan•Air Bleed at the Highest Point Helps Oil Quality and Aeration to Lash Adjusters•Does not reduce pressure to the turbocharger feed, this is still full pressure•Fits all 4G63 DOHC including DSM and EVO 8/9•100% Made in the USA