The DEI LS Engine Coil Pack Heat Shield is designed to help prevent coil failure by reducing underhood radiant heat that can cause coil failure. The LS Engine Coil Pack Heat Shield insulates and reflects heat away from the coils. This product is made from double-sided aluminum and a high-temperature foam core, and works on both factory and aftermarket coils, including MSD and ACCEL. The LS Engine Coil Pack Heat Shield features a pre-cut shield that installs under the coil bracket and is designed to work with factory covers.