Spectre's Twist-In Valve Cover Breather features an internal baffle to prevent oil splash and provide superior ventilation. This valve cover breather was designed for all valve covers with twist lock type oil filler holes. Manufactured from steel with a triple chrome plated finish, this oil filler breather cap features a smooth design to ensure it looks as well as it performs. Note: Legal in California only for racing vehicles which may never be used, registered, or licensed for use upon a highway. See spectreperformance.com for CARB status on each part for a specific vehicle.