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I don't have a ZL1 yet, But I had my supercharger replaced a few weeks ago in my CTS V, I think it is loud if not more so than the one they replaced? It is a different type of loud but still there? The service manager told me that some of the replacements are just loud? also replaced my rear end as it had a howl, The V had a recall on rear ends a while back from what I was told how about the Z? Looking forward to owning one in the near future.
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