Good info. I'm still on the fence about retro-fitting some of the simpler items like the Comp Pack springs, sway bars and bushings. We'll see though.
Other option might be to just wait a year or two and pick up a used LCI M5 with the Comp Pack and Carbon Brakes for way cheaper.
Also good to know that the Comp Pack Wheels offer no benefit performance wise over the 343M's, they are just for looks.