What a Breather Filter Does
A valve cover breather:
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Relieves crankcase pressure
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Prevents oil seal stress
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Improves ventilation on high-RPM builds
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Simplifies PCV routing for turbo setups
Especially useful on modified engines running catch cans or vent-to-atmosphere setups.
Key Features
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18MM inlet size
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High-flow filter element
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Washable / reusable design (model dependent)
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Metal or reinforced housing
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Direct push-on installation
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Lightweight and compact
Translation: quick install, cleaner setup.
Ideal Applications
Commonly used on:
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Acura RSX
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Honda Civic
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Honda Integra
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K-swapped chassis builds
Perfect for turbocharged or high-RPM NA K-series builds.
Compatibility:
Fit for Honda Civic Integra RSX K-swap K20 K20A K20Z K24 K-SERIES
Fit for Eg Ek Dc2 civic RSX with K-swap K20 K20A K24
Performance Benefits
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Reduces crankcase pressure buildup
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Supports turbo applications
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Cleans up engine bay routing
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Works well with catch can systems
Not a horsepower mod—but a reliability and airflow support piece.
Installation Notes
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Confirm 18MM valve cover outlet size
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Secure firmly to prevent blow-off under boost
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Pair with proper catch can setup if required
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Avoid routing near excessive heat sources
Because oil mist everywhere isn’t ideal.
Features:
Efficient filtration, optimized performance:
Using stainless steel + high-quality filter paper, effectively intercept impurities and enhance power response
Durable design:
High temperature resistant and corrosion resistant materials, adapt to the harsh environment of the engine compartment, and will not deform after long-term use
Quiet noise reduction, comfortable upgrade:
Significantly reduce ventilation noise, improve the quietness of the car, and make the driving experience more peaceful
Final Verdict
The 18MM Valve Cover Breather Filter for K-Series is a simple but effective upgrade for modified K20 and K24 builds. Cleaner ventilation, better crankcase management, and an easy addition to any K-swap project.
Because pressure belongs in the cylinders—not the crankcase.
Sidney –
Great addition for my MazdaSpeed 3 . Was making a lot of crankcase pressure. Very helpful