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Re: D1SC build
the only place you need a check valve is if you have the driver side PCV hose going from valve cover to intake. Thats the only one I run and I have no issues. If that hose is collapsing at idle its probably due to be replaced, if I remember correctly you may need to pull the pass fender liner to to get to the other end of it
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03 dsg mach1 - MPR built 9.5:1 motor, D1, cams, ported intake, full exhaust, magnum t56, built rear, E85 etc...
'12 F150 FX2 Supercrew with Ecoboost daily beater
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