A flat-six engine is a type of internal combustion engine that features six cylinders arranged in a horizontal layout. This design allows for a lower center of gravity, which can improve vehicle stability and handling. The flat-six configuration is commonly found in sports cars and high-performance vehicles, providing a balance of power and smooth operation. One of the most famous examples of a flat-six engine is used in Porsche vehicles, particularly the Porsche 911. This engine type is known for its distinctive sound and performance characteristics, making it popular among car enthusiasts and racers alike.