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MSD EFI LS1 / LS6 Ignition Control Harness
Product images may differ from actual product appearance.
Adapts MSD Ignition Control Box #121-6010 to work with your factory EFI system.
The Harness, which connects inline to the factory sensors, allows you to program an ignition timing curve, a step retard for nitrous use and select a two step rev control to help with consistent holeshots. You can even program a boost timing curve if you've fit your engine with a supercharger or turbo.