A short video posted to Subaru's Japanese social media teases the new sport compact, which will debut on January 9.

Explore how boxer engines really work, why they’re not just “flat” engines, and how Porsche and Subaru kept a 120-year-old design alive in some of today’s quickest cars.

When you think of boxer engines with their flat, horizontally opposed architecture, it's likely that vintage Volkswagens such as the original Beetle spring to mind. Or perhaps Porsche, which named an ...