Coil-on-plug Blaster coils from MSD are a direct replacement, high-output coil for Two-Valve 4.6 engines. The patented winding design improves spark energy and voltage output, and the coils are a direct bolt-in to factory connectors. The housing and installation are the same as the factory, but inside the MSD red housing is better material for the primary and secondary windings. There is also patented dual-magnet technology to step up the output. Together, this combines for higher voltage and spark energy. For '99-'04 4.6 Two-Valve engines, the coils are available individually under PN 8242. For a set of eight, order PN 82428. MSD Ignition, 915/857-5200, tech line: 915/855-7123; www.msdignition.com.