ESR is a superior replacement regulator/rectifier for the unreliable OEM unit. The OEM shaped regulator and is built to be a very efficient heat sink. The connectors and leads are of the highest quality and are direct plug-ins to the stock harness. This unit runs a lot cooler than the OEM regulator, and will give you a digitally controlled output voltage at all RPMs resulting in always having the optimum and stable charge rate across the whole RPM range. Mates perfectly with the ESR Stator shown below. Comes with a one year warranty under normal use and conditions. Will require a plug change on the OEM harness side on older models, if yours does not match the plug on the photo - CONTACT us above.