Subaru's WRX, Ascent, and Outback are the only new US models with a turbocharged flat-four boxer engine — and the WRX also ...

There's no replacement for displacement — or is there? While V8s have always been associated with big horsepower (and still are, at least when we're talking about the most powerful V8s ever), humble ...

The plastic cover of a Subaru Boxer engine showing the Subaru constellation logo - Topuria Design/Shutterstock Flat engines are horizontally-opposed piston engines, and this group includes Boxer ...

Flat engines are horizontally-opposed piston engines, and this group includes Boxer engines, but not opposed-piston engines like the Cummins 14.3L Advanced Combat Engine (ACE) designed to power tanks.