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The 20-0181 Crankcase VTA Catch Can Kit is an open (vent to atmosphere) system used for high flowing, high horsepower applications. The closed system options listed above are adequate for most modified street vehicles. However, some loosely built race engines operate with a large amount of boost pressure and the OEM hoses can become too restrictive for the excessive blow by. This VTA kit replaces the stock hoses and valve cover fitting with -10AN hose (5/8" ID) and allows the gasses to vent through the catch can to the atmosphere. The stock PCV valve is capped and not used (caps provided) in this kit.