i have a question there is a rs4 ,rs4 2 ,and rs4 3 ....i know what the rs4 3 can do ..but the other rs4 is there a place that can tell me how to up grade the rs4 2 and and the rs4 .....i just got the rs4 2 and i would like to know what i can do ....can i race it or is it a fun car ... i know that they looke the same but what is the difference