The first of its kind, Skunk2’s Hard Anodized Billet VTEC Solenoid Housing is designed to be used with any B16A, B17 or B18C cylinder head and is compatible with Honda’s original pressure sensor, solenoid internals, and gasket. VTEC Solenoid Housings for Honda's B Series VTEC engines are manufactured from 6061 billet aluminum, anodized exclusively in Skunk2's Hard or Black finishes for good looks and corrosion resistance.