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.

Fits all 4G63 Including DSM and EVO 8/9

100% Made in the USA Parts Normally Ship the Next Business Day