Performance Speed-Demon Muffler with Expansion Chamber BOOSTS PERFORMANCE: The Speed Demon High Performance Expansion Chamber drastically improves the stock power band with it's perfectly tuned chamber. It increase low end acceleration and top speed while keeping your bike quiet with the baffled muffler installed on the end. This exhaust is perfect for those looking for performance but do not want to increase the noise too much. SLEEK DESIGN: Similar to the banana pipe every motorized bicycle enthusiast knows and loves, this exhaust mounts very similarly as it hangs in front of the engine and points down under the bike. However it features a baffled muffler to keep noise low with out restricting performance. EASY INSTALLATION: Just unbolt your old exhaust and replace it with your new BBR Tuning Expansion chamber. It's that simple and just takes a few minutes. UNIVERSAL FIT: This 2-Stroke exhaust is designed to work with any 40mm stud spacing exhaust port common on motorized bicycles such as 48cc, 60cc, 66cc and 80cc. INCLUDED COMPONENTS: 1x Speed Demon High Performance 2-Stroke Expansion Chamber with Muffler