Breather Filter Black

The SPECTRE Breather Filter Black (SPE-3991) is a clamp-on conical crankcase ventilation filter designed for engines requiring reliable, reusable air filtration in closed-loop or positive crankcase ventilation (PCV) systems. Whether you're building a high-performance engine, restoring a classic vehicle, or upgrading existing PCV equipment, this breather filter reduces contaminant ingestion while maintaining optimal pressure relief. Its compact 4 x 2.25 x 6-inch footprint makes it ideal for tight engine bay installations where space is at a premium.

Engineered with a durable steel construction and finished in black with chrome accents, the Breather Filter Black features a 0.500-inch OD tube connection compatible with standard hose clamps for secure, vibration-resistant mounting. The conical filter element design maximizes surface area for efficient particulate capture while minimizing backpressure—critical for maintaining consistent engine breathing and preventing oil carryover into intake manifolds. As a reusable design, this filter can be cleaned and reinstalled multiple times, reducing long-term ownership costs while delivering consistent performance across diverse engine applications.

Street enthusiasts, drag racers, and engine builders benefit most from the Breather Filter Black's reliable filtration and minimal maintenance overhead. The 0.500-inch OD tube connection ensures compatibility with standard breather hose kits and custom PCV plumbing, making installation straightforward with basic hose clamps. Its lightweight design—just 0.165 lbs—adds negligible weight while its compact dimensions allow flexible placement in custom engine configurations, custom hot rods, and retrofit applications where factory breather solutions fall short.