This catch can runs inline with the PCV (positive crankcase ventilation) valve and retains it's factory function. Radium Engineering Catch Can Kit PCV Honda Civic Type R FK8 FL5 when the intake manifold pressure is close to or greater than atmospheric pressure, the PCV "check" valve closes and, thus, this hose experiences no flow. Conversely, the PCV hose will experience "metered" vacuum when the engine is idling, steady state cruising, and decelerating. This would normally draw unwanted crankcase vapor, unspent fuel, and oil sludge into the intake manifold immediately after a high load run. Note: No inline check valve is required since Radium catch cans are pressure sealed. This means a direct intake manifold connection is permitted.
 
Oil catch cans are essential on a performance vehicle to protect the engine from elevated levels of crankcase blow-by accumulated from high performance driving. Excess oil saturated air circulating back into the air intake stream can lead to degraded performance.
 
All Radium catch cans provide the following benefits:
-Effectively raises the octane and increased engine performance from cleaner inlet air 
-Prevents oil buildup in the intake and intercooler system walls, throttle body, intake manifold, etc. 
-Excessive oil collection can be an indicator of a damaged engine.
-Lowers hydrocarbon emissions 
-Capacity: 7 fluid ounces each
 
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