USA made CDI boxes. All CDI boxes (except 163-051) are an exact electrical replacement in a universal chassis which has adapters that mount using the original mounting holes. Warranty Disclaimer All CDI boxes are tested twice to insure quality. Before installing new CDI box, check all ignition components and connections to be sure they are within tolerances. If some components are out of spec, they can cause premature CD failure. However, no warranties are extended by the manufacturer and we will not be able to accept any returns on these units. Not for use on ultralight aircraft