Twin Power coils are the high-quality direct fit with at least 20% more voltage than stock. High-quality, molded-epoxy coils for 12-Volt H-D ignition systems increase peak spark voltage by 20% or more! In a late O.E.M.-style molded case, these ignition coils improve starting, stops, high-speed misfires, mileage and overall performance. They are available in black and chrome, and come with a one-year manufacturer's warranty.