Need an exhaust for your 2-stroke motorized bicycle that’ll give you performance without making too much extra noise? Then the Speed Demon High-Performance Expansion Chamber is exactly what your 66/80cc 2-stroke engine needs.
This Performance Expansion Chamber mounts the exact way its bigger banana expansion chamber does, all while increasing low-end acceleration, top end speed, and keeping your bike quiet with a baffled muffler. With its built-in expansion chamber and shorter muffler, your motor will get better airflow and increase your bike engine kit’s performance.
Long lasting, easy to install, and compatible with a huge range of 2 stroke engine kits, this Speed Demon Expansion Chamber and muffler will out-perform your stock motorized bicycle engine kit muffler like it’s nothing.

Motorized Bike Kit Performance Exhaust Muffler Upgrade with Expansion Chamber is compatible with any 2-stroke 49cc/66cc/80cc Bicycle Engine Kit. Replaces stock muffler with same bolt on pattern requires no modification. This performance muffler has a built in expansion chamber and shorter muffler allowing for better flow and engine performance.

*Note* This muffler does not come with a gasket or specific mounting hardware. However, your existing gasket and mounting screws should be sufficient to optimally run this muffler.

Gasoline operated products are NOT compliant with Environmental Protection Agency ( E.P.A. ) or California Air Resources Board (C.A.R.B) for the use on/off Public roads. Upon purchase, the buyer agrees to use products for racing (closed-course competition) only and NOT for on/off public roads.