Strongly considering your setup. Usually i would just burn through PS2's in my old e46M3; but it's getting out of hand and is much quicker on the e92M3.
One day at Laguna a few months back, and my fronts were shot for any street use (car would not drive straight); so I threw them in my garage and purchased 2 new fronts, rears were fine.
I have 1 track day at Infineon and 2 at Thunderhill next week, so I'll through the old PS2's back on the front. Figure after the next weekend, my old fronts will be toast and the rear will probably be pretty worn down.
Track rims here i come!
2008 E92M3-Space Gray
Eisenmann Sport Exhaust_MT/Loaded