BMW went with the I4 instead of some super duper boxer twin because they've learned from the past that a watercooled boxer twin wouldn't do it (google BMW R1). The current boxer twin did OK (mid-pack) against I4 in an endurance race, but will never be truly competitive. It may be competitive against a 600-cc (with some extensive mods like going from shaft drive to chain or belt drive and with shortened chassis) but no way in hell against a liter bike.
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Cogito Ergo Vroom - I think therefore I ride
 
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