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Vrooom! Turn your bicycle into a mean machine with Turbospoke, the Bicycle Exhaust System. Remember putting baseball cards into the spokes of your bicycle to create motorcycle sounds? Turbospoke takes it to the next level. Use one of the six Motocards to get the unique motorcycle sound you want. The cards are durable and waterproof for long-lasting, hard-charging fun. The specially designed Turbospoke Exhaust pipe amplifies the sound creating a motorcycle growl that people will notice. Customize your Turbospoke with the 15 decals included in the set. The set comes complete with everything you need to attach the Turbospoke to your bike, including tools and instructions. It mounts in less than 5 minutes to the lower chain-stay tube. Take your biking to the next level and turn up the volume with Turbospoke.