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yes, the drilled rotors are the supreme factor in the brake changes. they stock brakes are very strong in the beginning but heat is the reason for the "soft" feeling later on in track use.
So the drilled breaks are better in cooling down. Also, you could create a custom brake cooling duct with some elbow grease. downside is sometimes the rotors aren't drilled all the way though (not sure on m3), so when they wear down you can't flip them over.
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