I'll be installing Flex coilovers in a couple weeks with the stock spring rates. I know they need a larger than stock front bar but I'm uncertain of the benefit of one over the other. I like the fact that the tubular bar weighs less especially since its in the nose. Aside from this I also no it's stiffer than the solid bar. I guess my question is with the Flex rates would I notice a difference in balance between the solid and tubular bar? I also understand that it's advised to run no rear bar with the RB front bar and Flex. Is this true of both the solid and tubular, or does the stiffer tubular allow a stock rear bar.