BENEFITS OF THE SUBARU BOXER ENGINE
Flat layout allows engine output to flow directly into the transmission. This linear flow of power reduces engine components and inefficiencies, resulting in better fuel economy. Subarus are the most fuel efficient AWD vehicles in America, often getting better gas mileage than its FWD competitors.
By lowering the center of gravity of the engine, you also lower the center of gravity of the entire vehicle. A lower center of gravity = more responsive - particularly when cornering or doing evasive maneuvers.
Less vibration. The natural counter punch of the opposite piston cancels out unwanted vibration where inline and v-type engines require additional components to accomplish this.
Safety. In the event of a frontal accident, the boxer engine's low center of gravity allows the engine to drop "below" the passenger compartment instead of in it.
For nearly 50 years Subaru has been solely committed to the Subaru Boxer Engine in ALL of their models. The innovative design is part of Subaru's core DNA. Why don't other manufacturers use it? Porsche does in a few of their models including the Boxster, Cayman and 911 models. Porsche states, "This flat, short design results in a very low center of gravity and extremely smooth running."
For Honda, Toyota and others, it would be nearly impossible to benefit from a boxer engine because their architecture is not designed for the transmission to sit behind the engine. With inline engines the transmission often sits to one side of the engine, thus creating imbalance.
While you may not be doing evasive maneuvers on a test drive, isn't it nice to know that as an owner you have that capability if you need it. That's the Subaru Boxer Engine - a Subaru Core Technology!