Kiggly Racing HLA Pressure Regulator for DSM / Evo 8 & 9 / Eclipse / Talon 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