The Intake manifold hose is how the crankcase gunk gets from the crankcase to the manifold, the red hose youre asking about is positive air to push that gunk up and out.
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Mods: Z1 CAI, Fast Intentions HFC + Cat Back, 4.08 Gears + VLSD Swap, Southbend DxD Clutch+lightweight flywheel = 310 HP 285 ft/lbs
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