This is really old news, but I thought I'd share this with those who haven't heard of this one.
In 2003, Dodge played around with the Viper V-10 engine by slapping four motorcycle wheels on it. The result: the Tomahawk.
Dodge claimed this bike can do 0-60 in 2.5 seconds and a top speed of 420 mph. Of course, none of those claims have been proven, despite Dodge's interest in taking it out to the Bonneville salt flats.
Dodge sold ten copies of the bike through Neiman-Marcus for $550,000 each as rolling sculptures, as they're not street legal and Dodge intentionally excluded a few key components to make them operational.
Maybe this can be used as an alternative to the Batcycle.
2003 Dodge Tomahawk Concept