3in Breather Pre-Filter Black

The 3in Breather Pre-Filter Black from OUTERWEARS is an essential engine maintenance component designed to protect your vehicle's crankcase ventilation system from contaminants. Whether you're running a naturally aspirated engine or a turbocharged build, crankcase breathers accumulate blow-by gases that carry oil mist and particulate matter—unfiltered, this leads to deposits in your intake manifold and reduced engine efficiency. This pre-filter intercepts those contaminants before they reach your main air intake, extending the service life of your engine and maintaining cleaner combustion.

The 3in Breather Pre-Filter features a compact 3.5 x 1.4 x 4.9 inch profile, making it easy to integrate into existing engine bay layouts without sacrificing clearance or forcing relocations. The black finish resists UV degradation and blends seamlessly into modern engine compartments. Its three-inch inlet diameter matches standard breather hoses found on most American and import platforms, while the internal filtration media captures oil vapors and airborne particles that would otherwise foul your intake. The lightweight design—just 0.02 lbs—adds negligible weight while providing reliable, low-restriction performance during both street driving and track sessions.

Enthusiasts running custom intake manifolds, high-flow air cleaners, or modified PCV systems benefit most from this breather pre-filter, as it isolates your fresh-air intake from crankcase blow-by completely. Installation is straightforward: simply position the filter inline between your breather outlet and intake manifold using standard 3-inch hose connections. Recommended for street vehicles, weekend warriors, and performance builds where engine longevity and intake cleanliness matter. Check your engine's breather port size and hose routing before purchase to ensure compatibility with your specific platform.