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Spectre’s breather filters are designed to clamp directly to metal or plastic tubing, making them ideal for filtering the air going in and out of your engine’s oil, transmission and differential vents. Spectre's breathers come with air filter media, or screen mesh. These filters are 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.