This is a very high quality, great sounding Performance Exhaust Muffler System for the GY6-50cc/80cc/100cc/110cc/125cc (for Big Bore Kits on the GY6-50 base), 139QMB, 1P39QMB engine for top-end power. Muffler system with a great look and sound! This system includes the mounting hardware and head pipe. This system sounds great! This fits for Baja, JMStar, Jonway, Lance, Longbo, NST, Roketa, Sunl, Tank, TNG, Vento, VIP and many others. Fearture: Potentially add more performance, speed and power to your bike with this high performance exhaust pipe. Also provides a stylish look and a deeper exhaust tone. Muffler is approximately 3.5" in diameter x 12" long (not including the exhaust tip). Fitment: Fits on many models of GY6 Scooters and Mopeds Four Stroke 50cc with the GY6 QMB139 series motors. Comes with brackets welded to the pipe for the GY6 50CC application (some modification may be required). It will not just "bolt on" to every scooter model. You may need to bend the brackets or make other modification to make it fit.