Check this out! Now, this isn’t the very first Boxer-powered motorcycle…BMW has a crap-ton of them. Honda’s Goldwings have always used the horizontally-opposed engine configuration, as well. I like this one, though, because both wheels are powered. As well, that black engine looks sinister! I’m not sure if the coloring has been photoshopped to represent WRX/STI rally colors (rally blue with gold wheels…Subaru trademark).
There’s also this:
This IS powered by a WRX engine, but it’s also just an electronic sketch. Be sure to visit that link, because it has a ton of pictures of the bike and engine…it also has a quick article on how the bike was designed.