Subaru and flat, or "boxer" engines are practically synonymous with one another. Beyond the Japanese automaker and Porsche, no other major manufacturer regularly utilizes flat engine configurations ...
Car geeks love a weird flex with their engines, and this one comes straight from Japan. Imagine a flat-four boxer engine with two turbos working in sequence, chasing boost like a rally stage start.
Automobiles, as any mechanic will tell you, are complicated beasts. Enthusiasts, of course, will have a solid grasp of the jargon. They'll know at a glance what the unusual shape on that road sign ...