VMP has designed the ultimate lower intake manifold-to-supercharger gasket seal for GT500s and Coyotes. The VMP Boost-Lok gasket prevents boost loss due to the fold-over issue common in high boost situations with the factory gasket. Direct replacement for the black Ford gasket 7R3Z-9H486-AA Double-hump design on the bottom and top surfaces of the gasket prevents fold-overHolds high boost without leaking. More dimensionally accurate than stock to facilitate easier installation into the machined receiver groove in the lower intake. Fits '07-'14 Ford Mustang Shelby GT500 5.4 L and 5.8 LFits '11-'17 Ford Mustang GT with Roush or VMP superchargers using Roush-style lower intake manifoldRed FKM Viton fluoro-elastomer synthetic rubber to resist oil, gas, and alcohols.