Molded from 25% mineral filled, 15% fiberglass reinforced Hylon Nylon 6. This is the same material used for many OEM engine covers such as the LS-1 series for the Corvette. It is good to temperatures above 350 degrees F. The finish is a high heat urethane. The engine covers clean up the look of the engine bay and gives you the look that Ford had under the hood on the original Mustang concept cars. Covers bolt into place with existing studs, so they are easy to take off and put on. Some covers feature either a GT or 4.0L emblem. This Plenum Cover may not be compatible with some aftermarket strut tower braces.  Please carefully test-fit this piece before installation.