I've run Legends since they were introduced following the Legends set-up. here in Fla we went to two seperate sets of rules but the present 2018 rules won. I've asked Rick Jordan about a new 2 cell GForce battery that looks like a six cell but is a lipo. Using the new cheap motors they have always used. Waiting for an answer. But I would run the present rules in the kits and listed on the RJSpeed site- they work!!!!! Snowbirds has always followed the same rules that comes in each kit. Presently the six cell 2000's are really fast. The class was created to keep things simple and fun . If you want to try the CRC rubber tires and your running on carpet that would save you money in the long run ( No truing the tires). Tried to get that as a class at the birds this past year . We did have it as a class at the Minregg Turkey race and they ran fine.