Twin Power coils are high-quality direct fit with at least 20% more voltage than stock 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 Replaces OEM 31655-99 One-year manufacturer's warranty