This exhaust pipe is the BEST exhaust pipe for air-cooled mini moto. The whole pipe and the sliencer are made by stainless steel, NOT silver coating. With the S shape and its stainless steel material, it gives totally different power and performance among all other exhaust pipe. Even you do not have any modification with your bike, install this pipe would give your bike outstanding power. For those installed big bore engine kits, install this pipe can have double power increases. The whole pipe combined with two parts which provides more easy installation and it has springs to mount them tight.