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. They have 0.5 Ohms of resistance, provide a smoother idle and crisper throttle response, and are backed by ACCEL's famous limited lifetime replacement warranty.