The low-buck drilled and slotted rotors are OK for normal street use and the "cool" factor. If you intend to do any high-speed autocross or open track days, stay away from them!! These cheap rotors that are drilled after casting will crack with exposure to extreme heat/cooling from high-speed use. Once they begin to crack, you are at risk of a rotor failing (coming apart ).
The high end "drilled" rotors from companies like Brembo and Wildwood have the holes in them as a result of the casting process and then everything is machine finished. Price a set of Porsche or Viper OEM rotors and you can see the difference. The C6 will have drilled rotors and you can bet that those will cost a fair abount of money to replace.
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