Want to run the Holley Sniper EFI System with timing control but without a CD box like the MSD 6? Then you're going to need this Coil Driver Module. One of these was included in each Sniper EFI System but in the event you have misplaced yours here's what you need. For a simplified explanation of the Sniper EFI's igntion control wiring, check out this article in our EFI Pro Hangout!