This Max-Fire Coil-On-Plug ignition coil pack is for use with 1997-2014 Ford 4.6L, 5.4L and 6.8L engines with 2-valve cylinder heads. It's a direct bolt-on with OEM DIS electronic controls and aftermarket high performance ignition systems. Its designed with higher resistance for increased aftermarket high performance ignition systems. Its designed with higher resistance for increased energy output at higher RPM when compared to an OEM coil. Ideal for use with turbocharged and supercharged applications or engines that have been converted to E85 fuel. It also been sealed with a high temperature epoxy for shock and vibration resistance that also provides excellent thermal conductivity. The spark plug spring contact is made from stainless steel with a ferrite lug to reduce EMI/RFI noise. The spark plug boots are molded from a high temperature silicone compound for superior heat resistance up to 550° F. The listing below is for a single coil.