Turbospoke - The Bicycle Exhaust System
Buy here: http://www.speedwaymotors.com/turbospoke,50683.html
turbospoke is a complete Exhaust system that fits to any bike and makes
it look and sound just like a real dirt bike. turbospoke is based on the old
'baseball-card-in-the-spokes' concept, brought right up to date. The
realistic engine sounds are created using long lasting plastic cards, a
clever sound chamber and an awesome megaphone Exhaust pipe which really amplifies the sound.