ESR161 is a high quality regulator rectifier that is designed to replace the regulator on various Arctic Cat models. Our ESR161 has a built in finned heatsink which allows for quick dissipation of heat. We incorporated the latest regulator circuitry which allows for a very stable output voltage across the RPM range. This unit is simply the best regulator/rectifier you can buy for your Arctic Cat ATV. Like all other regulator/rectifiers manufactured by ElectroSport, this ESR161 comes with a full one year warranty.