Here are a few ways that you can make your Kawasaki Mule quieter:Replace the muffler, use sound-absorbing materials, wrap the exhaust pipe with a noise-reducing wrap and follow the manufacturer's recommendations for maintenance and use.It is important to note that making modifications to the vehicle may affect its performance and may also void the warranty. It is always a good idea to carefully research and plan any modifications to the vehicle and to consult with a mechanic or other qualified professional before making any changes.