Quote Originally Posted by niky View Post
Interesting to note... the highest specific output (meaning: horsepower per liter) for road-legal vehicles available from a major manufacturer, are about 120 hp per liter on the 240 hp Civic Mugen Type RR (for naturally aspirated engines) and 200+ hp per liter on the 400 hp Mitsubishi Evo FQ400 (for turbo). Both are only limited editions (Mugen RR in Japan only... FQ400 in the UK only) but they come with full warranties.

And they're both inline fours.
Isn't it the stock Honda S2000 (N/A) that produces the most HP/L?