Prevent crankcase oil fumes from condensing and filling your intake piping, turbo piping, intercooler, intake manifold, and breather system
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Used to cap off the the vacuum port on the side of the intake manifold for vehicles running catch cans. Includes a tap to supply vacuum to a boost gauge.
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Your engine ventilates its crankcase back into the intake to burn off the oil vapor and carbon, but that means your valves and intake are coated with the gunk from your crankcase. It also means you're putting things that aren't air or fuel into your mixture, which means less performance
