10. 1961 Aston Martin DB4 Zagato
As a world-renowned sports car brand, Aston wanted into racing in the early 1960s, briefly becoming the owner of “the world’s fastest production car” title. Their weapon was the Aston Martin DB4 Zagato, a lightweight 300 HP version of the DB4 Grand Tourer (via Motor Trend).

Aston’s engineers tried hard to achieve this power output with three carburetors and two spark plugs per cylinder. The original example sold for over $13 million.