ACCEL Black Twin Cam SuperCoils deliver up to 45 percent more peak voltage than OEM coils. Specially designed for lightning-fast rise times, extended spark duration, and maximum spark energy, they bolt on in under an hour in the OEM location, and right under the coil covers you already have on bikes equipped with electronic ignitions. Compatible with both points and electronic ignitions, these single-fire coils are a direct fit for carbureted bikes.