2.7L DOHC H-6 boxer (Porsche Cayman)
There’s no way we can forget about horizontally opposed engines can we? Porsche’s 2.7-liter flat-six engine found in the Cayman and Boxster makes the list, and is an under-appreciated aspect of theses affordable sports car’s performance. Making 275 hp and 213 lb-ft of torque, the engine isn’t extremely powerful, but exceeds expectations thanks to the Cayman’s light weight. Porsche packed the engine with new tech in order for it to save fuel, including direct injection, a start-stop system and variable valve timing. It all helps the car deliver 32 mpg on the highway, which is a solid number for a sports car.