This plate is used to block off the Vortech Blow off valve flange when switching to a larger blow off valve. This bolts right on and re uses the gasket that comes with the kit.
Fits 2011-2014 Mustang GT/Boss Only. 2015-up kits do not require a block off plate.
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This does exactly what it says, blocks off stock bypass valve flange and allows you to run only the tial. Good product