theres two kinds of pan, on road and oval. on road is pretty popular. you can use regular size electronics expect u need a mini servo. most 12th scales now use 4 cell saddle packs and a few like the crc carpet knife uses 4 cell stick or side by side. for adjustability, its not limited. there many ways to tune 12th scales. if ur planning to be racing or competitive these cars are great! dont waste ur money on 1/18th micros.