most powerful 4 cylinder production engine
Mitsubishi Lancer Evo X: 145 bhp/liter. The Lancer Evo is leaving us soon, but for now, it's still a car with one of the most power-dense engines on the market. Its 2.0-liter four-cylinder is turbocharged up to 291 horsepower, giving it a specific output of 145.5 horsepower per liter.