this guy has 4.10's and wants to trade for my 4.30's. everyone keeps telling me imma lose my top end power. is this true ?? i do alot of roll racing from like 45-50punchs and sometimes 20. what should i do ?? is there a big diff between the 4.10 and 4.30 ?? which one would help me out better ?? i keep getting sucked up at 100+ by turbo'd cars n such......