I have always run autocross and track days with all nannies off in this car.
I haven't had CBC coded out, but despite hearing the complaints from others about its effects, I have never been bothered by it. At this point, I am either used to it, or my braking technique doesn't bring it into play as obviously, or both.
__________________
1M track toy mods: BMS chargepipe, BMS OCC, ADE FMIC, ADE motor mounts, MadDad/Lightweight Ti exhaust, ADE custom oil thermostat/cooler, custom MHD tune, F10 550i clutch, Ohlins R+T, Vorschlag camber plates, M3 'vert FSB with Turner endlinks, Stoptech Trophy BBK.