I'd recommend looking to motorcycle engines then, if you want needlessly fast. Some of them on the market, stock, are showing impressive figures of over 150 HP per liter of displacement. Modified, the numbers can get into the 400+ HP per liter range...
Quote:
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Top speeds of over 270 mph, engine outputs of over 700 horsepower, and performances in the standing quarter mile as quick as 7.125 seconds and as fast as 209.14 mph have been recorded by street registered Hayabusa motorcycles using standard-width (190mm) DOT-approved street-legal rear tires.
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http://en.wikipedia.org/wiki/Suzuki_Hayabusa
*drool*