Edelbrock part #22745 Max-Fire LS Coil Pack is designed for use with 1997-2013 GM Gen III & IV LS engines. It features a high output design that delivers up to 11% more voltage and 19% more energy over a stock coil. It's ideal for use with supercharged, turbo, nitrous or E85 fueled engines. Edelbrock Max-Fire Coil On Plug ignition coils are designed with higher resistance for increased energy output at higher rpm, when compared to an OEM coil. The coils are sealed with a high temperature epoxy for shock and vibration resistance as well as excellent thermal conductivity. The spark plug spring contact is made from stainless steel, with a ferrite lug to reduce EMI/RFI noise; while the boots are molded from a high temperature silicone compound for superior heat resistance up to 550 degrees F. Order the direct bolt-on OEM coil pack best suited for your vehicle. Be sure to check your stock coils on your truck or van to make sure they physically match. GM offered several styles of LS1 coils that are not all compatible with each other. Sold individually.