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Building a motorcycle one has to think about where that engine will live, relative to the wheelbase. In most cases you want the weight to be distributed 50/50 front to rear. If you put the intake on the front that means you have to position the bulk of the engine farther back so the intake tract (fuel injection, air box, etc) do not hit the front wheel. Most manufacturers opt to put the exhaust side fwd and intake aft so it is easier to package everything. Maybe BMW has figured a way to make this work, time will tell.
Peter Y.
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