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Too much and it doesn't cut that much weight off of a car. If you take into consideration the difference between steel vs carbon then add the 6 piston calipers , a difference of about 15-20 lbs isn't much of anything. To drop weight of the car, brakes are the last option IMO. Besides, cc brakes are too expensive unless your purpose is to track it.
If they have cc brake option it'll be about $9-12k with the calipers included which GM would include.
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