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Originally Posted by sperry
It allows for a much lower CG, and a shorter depth (which is good for the way Subaru does their AWD with the motor completely in front of the front axle), but yeah, a flat motor isn't the most efficient use of space, especially w/ DOHC.
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It is efficinet in the use of vertical space and when you are building a sports car in which lower CG is better, that is good. Porsche wouldn't use horizontally opposed engines if they didn't have significant value over other configurations.