Fits for Most of Chinese Made Scooters and ATV. which for GY6 125cc 150cc based engine. Please choose the correct one that fits your vehicle. Extra weld-on mounting bracket is included. Modifications in mounting of the Head Pipe may be necessary. Please install according to your own needs. Fits for many scooter models with a 125cc -150cc GY6 engine. Please confirm before purchase. Without instructions. With baffle Sounds low , Removed baffle souds loud. Install according to personal needs.