“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.” Sounds more like a drawn-out fart than a motorcycle engine, but . . . I guess that’s a “real motorcycle sound” if a Harley is a real motorcycle.