Accel Super Stock Spiral Core Spark Plug Wire Set For Harley Softail Features Delivers up to 5 times more energy to the spark plugs than even the Screaming Eagle wire sets, yet they are fully compatible with the Delphi fuel injection systems ACCEL's advance technology spark plug wire construction and low resistance Ferro-Spiral delivers maximum energy while not tripping the check engine light like most other wire sets The high temperature boots and wire can withstand over 500 degrees and not miss a beat