Overview Reviews Product Description 561-103 Holley EFI Spark Plug Wire Set -Holley SmartCoil Packs Holley EFI LS wires are designed to work with Hooker shorty headers to prevent burns resulting in misfires. Product Videos Custom Field Product Reviews Write a Review Write a Review × 561-103 Holley EFI Spark Plug Wire Set -Holley SmartCoil Packs Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *