There is nothing worse than losing a race or not making it up a hill due to a coil wire slipping off. To make your coil wire connection full-proof, MSD offers this Coil Wire Retainer. The Retainer is molded from Rynite and features a "hood" that pushes down on the coil wire boot and secures it in place. Fits all Blaster Coils (except High Vibration and the Blaster 3) and will work with most other aftermarket canister coils.