Product is tested.Fits many Scooter models with a 50CC -400CC GY6 engine. Fits Most of Chinese Made Scooters and ATV.Such as JMSTAR, JONWAY, TAOTAO, ROKETA, SUNL, TANK, PEACE, JCL, Coolsport, Kazuma. Note:The size of the head pipe is designed for engines smaller than 150cc. If our engine is larger than 150cc, you may need to prepare the corresponding head pipe.Or cut off the old flange and weld the extra new flange that we offer to your head pipe. On some models, after installing the head pipe, you may need to heat it and bend it slightly to keep the gap aligned.This is very important and helpful suggestions,thanks. Sounds great and has a deep tone. This high-performance exhaust pipe can add more performance, speed and power to your bike.Quality Guarantee:Made of Aluminum.and Stainless Steel Welding connector. The package includes all the parts shown in the image and extra weld-on mounting flange.Complete Exhaust System: Head Pipe Muffler, Gasket, Mounting Hardware and an e