The Detroit auto show has seen a lot of concept cars over the decades, but a four-wheel motorcycle powered by a 500-horsepower V-10 engine is a first. January 10, 2003 Detroit, MI - The Detroit auto show has seen a lot of concept cars over the decades, but a four-wheel motorcycle powered by a 500-horsepower V-10 engine is a first. And it may turn out to be more than a concept.

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