BBR Tuning Dual Torquer Up 2-Stroke Motorized Bicycle Exhaust Pipe Muffler &ndash; Gas Bike Performance Double Exhaust Upgrade BOOSTS PERFORMANCE: The BBR Tuning Torquer Up Exhaust features an expansion chamber that drastically improves performance over stock. This provides an increase in low to mid torque while increasing top speed. Since this exhaust features a muffler on the end you can expect the same quietness of stock but with a more deep sound all riders are looking for. SLEEK DESIGN: This exhaust is a long shot muffler that extends towards the back of the bike and a dual muffler output. It's designed to keep your bike looking great with it's stylish fit. EASY INSTALLATION: Just unbolt and remove your existing exhaust and bolt on your new BBR Tuning Dual Torquer Up Exhaust. NOTE* Due to the length of this muffler you will need to use brackets in order to keep the muffler mounted and supported properly 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 BBR Tuning Dual Torquer Up Expansion Chamber Exhaust with Double Muffler