I'm running PS2 at the front and PSS at the rear. Plan to switch the PSS all the way around eventually. Having said that, I only drive the M3 on the streets, not sure I'd do that at a track event.
Current: E92 M3 Sparkling Graphite/Bamboo Beige/6MT. E36 M3 Techno Violet/Dove/5MT. E85 Z4MR Alpine White/Imola Red/6MT