What are the advantages and disadvantages of a flat engine?

Flat engines, also known as horizontally opposed engines, offer several advantages, such as a lower center of gravity, which enhances vehicle stability and handling. They also tend to have a compact design, allowing for better weight distribution and improved aerodynamics. However, disadvantages include a more complex design that can lead to higher manufacturing costs and maintenance challenges, as well as a limited market presence which may affect parts availability and service options. Additionally, the unique shape can restrict certain vehicle layouts or configurations.