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I do not think that the C7 ZR1 had any negative effect on C6 ZR1 values. If anything the fact that Chevy actually built the C7 ZR1 would probably add to the C6 ZR1's collector's value, because was so powerful and rare, and was the new Corvette king of the hill again. I think that the car that lowered the value of the C6 ZR1 was the C7 Z06, being cheaper, newer, and better overall. Of course the C7 Z06 had teething problems initially, but once those got worked out, and used C7 Z06 prices fell, then C6 Z06 and ZR1 prices fell as well. The C8's value and effect on earlier Corvette's value will be more complex because the C8 Corvette is a new design, with new engineering.