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I think it became a cost:benefit thing. There was a guy around here who had a pretty quick 350Z using the GReddy twin turbo set up. He was making very decent power but was ultimately upset that he could have used the money (net) on a Z06 and been so much better off.
It's not that the owners don't love their car, it's just they are working with a budget and for what they can do with one platform + so much money invested, another platform just makes more budgetary sense.
The cars may be able to hold up just fine, but given this cars 12.5:1 compression, they were probably told by a tuner, "If you want to make more power, we're going to have to replace the pistons. The pistons are this much, the labor is this much."
After hearing that and considering the money they've invested for the return they got... they most likely found it was better to quit while they were ahead.
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