MSD designed this 826383 Blaster Ignition Coil Set for 1999-2007 GM LS Gen III/IV Truck engines. Designed with improved materials and windings, these coils produce a stronger spark, which burns the fuel mixture more efficiently. This results in improved mid-range RPM power and a smooth idle, making them ideal for your modern GM muscle car or truck. These coils are designed as a direct bolt-in replacement and maintain the factory fit. They have been thoroughly tested and detailed by MSD’s experienced engineering team. MSD 826383 Blaster Ignition Coil Set Features: Fits 1999-2007 GM LS Gen III/IV Truck engines Replaces: GM 10457730 and GM 19005218 Coil Color: Black Coil Shape: Round Coil Style: Coil Pack Coil Wire Attachment: Female/Socket Coil Internal Construction: Epoxy Mounting Bracket Included: No Ballast Resistor Included: No Coil Wire Included: No Quantity: Sold as a set of 8 From street cruisers to Top Fuel dragsters, MSD's ignition systems have been the industry leader for over 40 years. MSD continues to push the envelope with cutting-edge ignition technology as well as intake manifolds and EFI systems.