Hello all, kinda new, mostly been lurking for sometime. I have an 04 Comp G, small mods done performance wise, but now it is time to do some suspension/brake updates. At the miles where I am starting to get the dreaded squeak from the rear and one of my struts are leaking. So I am going to do everything. Mind you I run a full service shop in St.Louis, so cost and parts are not an issue. Here is what I have figured out and am doing. Suspension- new OE struts, springs, all new bars in the rear, new end links and sway bar bushings. On the rear brakes looking at just leaving stock and doing Powerstop or Centric drilled rotors and pads, or swapping to the GXP set up. My question is will I get much better stopping power with the rear GXP setup? I seen that I have to change the wheel hub assemble.. but why it is the same part on my 04 as it is on a 07 GXP. I have matched both of them side by side and by part number. On the front I am doing new struts and springs, new end links and sub frame bushings. Doing must just for the hell of it. On the brakes I am looking at most likely doing the 06+ Impala dual piston setup, same rotors and pads on the rear. Mostly doing it for looks. From I have read the 06+ Impala is a better or easier swap than the GXP front. is that correct? Less pedal fade and no need for brake pedal assemble. Also adding lines. Any input?