1" H22 Intake Plenum Spacer (IACV Compatible)

Unlike our traditional spacers, this 1" spacer is designed to accommodate the iacv port in a factory upper intake plenum.  Full open spacers leave the iacv ports exposed on the inside of the manifold, but this spacer is cut with a profile that will block the exposed port while still being as open and free flowing as possible.  **Though possible to run in place of the factory IAB plate, to get the full benefit these should be ran with a modified upper and lower intake plenums.  These are compatible with all H series and F20b intake manifolds and are the same thickness as a factory IAB plate so no additional hardware is needed.