Australia customers E46 M3 race car  factory brake system upgraded with ATRT high performance big braking system.
 

Front : ATRT ZS-IV big 8pot brake caliper + Ø355mm full floating slotted rotors.

Rear : ATRT ZS-IV big 6pot brake caliper + Ø355mm rear drum slotted rotors.

For all your race car needs ,Nice upgrades done.