I've read a lot of Commander threads of people putting larger throttle bodies on and not gaining anything. In my humble opinion, there's only one cylinder sucking air in at a time through a pair of intake valves. Those valves probably don't need a larger throttle body. You could put a 106 millimeter throttle body on it, and only as much air as can go in that one cylinder at a time is going to be used. If I were looking for more power, I would rather buy a dyno verified matching set up from one vendor. Just my 2 cents.