Kinda, sorta, maybe! I think that it may have quieted down from the outside as well, but can't be 100% certain. The miserable @ssh0le a few houses down always waves his fist at me when I drive by so the Z is still loud. The loudness in the interior has definitely dissipated somewhat. I think that after I had my Z1 CAI installed, the exhaust doesn't seem to bubble and burble as much as it did with the OEM intakes.
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