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Based on what I've read, what the M3 seems to need more than an actual set of bigger brakes (which most reviewers have raved about) is better cooling for the ones it has. On all BMWs (and pretty much any other car I've ever looked at) there are brake cooling ducts integrated in the front bumper. In the E9x M3, all the air going into the front bumper is routed to cool and feed that big V8. The GTS has a revised bumper which has brake cooling ducts so I would be surprised if they weren't added as part of the ZCP since the main issue people have with the brakes is their tendency to overheat and fade on the track.
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