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Wrong to all contrary. BBK does provide more braking torque by using a larger rotor diameter and larger brake pad surface. Also the design provides consistent braking by allowing to disperse heat better.
To OP none of the e9x m3 platform (except GTS and CS which came with Brembo from factory) offer upgraded caliper.
Unless you track your car regularly a bbk is just for looks.
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///M3... Don't want more power, Just want it to turn sharper one step closer each time. -Ohlins TTX Raceline, PolePostions seats, Akrapovic EVO, ARC-8, 1/2 Cage, Seat Delete, Stoptech BBK, solid Subframe and diff bushing, spherical bearing on everything.
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