Supercoils produce up to 15% more spark energy then OEM, better throttle response, maximize fuel mileage, less than an hour to install.ACCEL Supercoil featuring up to 15% more spark energy than OEM coils! These coils feature advanced bobbin technology, highly specialized silicone magnetic steel cores, optimized winding, resistance, and turn ratios to deliver up to 15% more energy than the OEM coils. Specialized high temperature epoxy resists shock and vibration, while increasing thermal conductivity. These are direct replacements for OEM coils and will work with all factory sensors. Bodies and/or secondary towers molded in ACCEL yellow.