actually, a cranker is the opposite of what you two said. snowmobile cylinders on a banshee bottom end. the reverse cylinder bike in question is a pair of factory banshee cylinders spun around on the motor. carbs in front. pipes straight out the back. it is a big undertaking to do. you have to weld up and then re-cut the transfers in the case. not sure if it is worth the little bit of extra power you may get.
does look REALLY trick, though.