Twin Power Ignition Coil For Harley Fxcw / Fxsb/Se Features High-quality, molded-epoxy coils for 12-Volt ignition systems increases 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, increases mileage and overall performance Come with a one-year manufacturer's warranty OEM Replacement 31684-11