i would say it doesnt matter stock or pro. if you move up to pro u will have to buy a 16volt amp and 16volt bats if u want to win. if u keep your 12volt set up you will have to be about a db louder that everyone just to tie. cause from what ive seen and what people tell me basically a 1db gain from 12 volt to 16 volt. i would also say why not just stay n stock its not like your compeating against new people i would be more that half the people that run stock and will be at finals running stock. will have gotn their product under dealer cost! so if i was to bet i would really say prob over 80% dont and will not pay for anything above dealer cost. so if it was me i would stay in stock if you like that class. the whole sponcer and non sponcer rule is stupid and it hasnt worked since i started in 2001!