## Tune-Ex Sport Exhaust for 139QMB/QMA (GY6 50) 4T Scooters This Tune-Ex sport exhaust is designed specifically for scooters with a 4-stroke GY6 139 QMB engine, particularly those with smaller 10-inch wheels. It provides not only improved performance but also a deep, bassy sound that enhances the sporty character of your scooter. ### Performance and Sound The through-flow design of the exhaust minimizes exhaust flow resistance, resulting in a noticeable improvement in engine performance. At the same time, thanks to the use of appropriate soundproofing, the muffler generates a pleasant, bassy sound that is not intrusive. ### High-Quality Construction The Tune-Ex exhaust is characterized by very good workmanship and attention to detail. Its robust construction guarantees long life and resistance to weather conditions. ### Compatibility Before purchasing, please carefully compare the mounting method of the muffler shown in the photo with the mounting on your vehicle. Over the years, different types of mounts have been used that are not always compatible. ### Summary The Tune-Ex sport exhaust is the ideal solution for owners of GY6 139 QMB scooters who are looking for a way to improve performance and give their vehicle a sporty character. The combination of high-quality workmanship, attractive sound, and thoughtful design makes this exhaust an excellent choice for any tuning enthusiast.