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Are you tired of scouring the junkyard for stock ls coil harnesses Introducing the new Holley EFI LS Coil Harness. This coil harness is intended to be used with factory LS coils and various Holley EFI main harnesses with Coil-on-plug connectors. The Holley EFI LS coil harnesses are built with the same high quality connectors and wire loom found on all Holley EFI harnesses guaranteeing a perfect match in your engine bay.