I'm no expert or professional driver:
I have 1 mil miles in BMW/Porsches, 500k in M3's alone
my first Porsche was in 1977, first BMW in 1981...
at least 40+ driving schools, several DoD, etc.
I used to race (club) 911's and 2002's...snow, ice, dirt/gravel, tarmac
I have at least 200k 'just for shytes & giggles' miles...back roads, etc.
I'm a novice...I admit it...it keeps me from doing stupid things
I would not be faster with Brembos vs oem on any M3...especially on the street...
you want a track car? get a 944 or 325 and strip it down/build it up...
but for most classes, stock brakes are required...iirc, sliding/1 piston on both
as far as cost being the reason BMW made their choice:
anybody know the following pricing?
e92 M3 front caliper/carrier/rotor (it's >$900 for the e46 M3 ZCP per side!)
e87 135i front caliper/rotor
just curious...