Pretty rare for a track to not allow a .28 during club races. As for the fuel tanks, most of them come with a removable plug that will keep them at the legal limit. I'd never have an issue with a racer bringing an RTR .28 equipped buggy to the track; the more racers, the better. Over time he/she will outgrow the RTR engine and get something better suited to racing (a fuel efficient and smooth powerband .21).