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I just got mine replaced this last week. Not too fun of a situation. For one, the service advisor had never heard about the problem (mine was bad, the rattle went immediatley to the squeal within a few days.). I dropped it off on Friday morning, and not until Tuesday morning did they decide to replace the supercharger. The advisor said that they couldn't get the squeal to replicate and didn't know if the rattle from the supercharger was normal or not. They decided to compare it to a brand new ZL1 and I also had to send them recordings of the supercharger squealing and rattling for them to get approval from GM. Additionally, they tried showing me this bulletin about not replacing the supercharger if there is a rattle. The bulletin was for the supercharger flutter on the replacement superchargers. Got the car back the following Friday with the new supercharger. In all honesty i'm not very impressed with GM's handling of the situation. I believe that if they know these superchargers are prone to failure then they should be replacing them without the supercharger beginning to fail first.
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