I'm trying to help a buddy out for this Friday race night. For the summer season we are just running USGT 21.5. The issue is he has a 2013 BD7 and we cant get the gearing to work. Wondered if there is a different motor mount set up? We went to smaller spur gear to allow for a bigger pinion. But the support just in front of the motor mount is in the way. Suggestions please. or does he have to buy a 2015?