So I'm seriously considering getting either an RX or an RS for racing but I'm not sure if I would be better off getting the RX at half the cost and tearing it down and then building it up for racing or just getting the RS. Why is the RX so much heavier? Where does most of that weight come from? If it's just items that are getting pulled off for the track anyway then it seems like a no brainer.

I know nothing about these bikes as I've always been a gsxr guy.