The Moroso 25901 Crankcase Evacuation System is engineered to reduce crankcase pressure across the full RPM range, improving piston ring seal while minimizing oil leaks and intake charge contamination. Track and dyno testing consistently show measurable gains in engine performance when crankcase pressure is properly managed. This black powder-coated system provides a clean appearance along with long-term corrosion protection, making it ideal for high-performance and race applications.

Moroso 25901 Crankcase Evacuation System Features:

• Reduces crankcase pressure for improved ring seal and engine efficiency
• Lowers oil contamination of the intake charge for more consistent performance
• Black powder-coated components for durability and a clean engine bay appearance
• Track and dyno proven to enhance engine output
• Includes two oil separator/breathers, two breather/filler cap grommets, one one-way check valve, and one weld-in nipple for header collector
• Designed for use with 5/8 in. diameter hose (not included)

Moroso 25901 Crankcase Evacuation System Notes:

• Not recommended for vehicles equipped with mufflers
• Not compatible with systems using downstream oxygen or wideband sensors
• Requires welding the included nipple to header collector for proper function