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I read a post a month or so ago where the ZL1 owner commented how much quieter his car was after adding sound deadener and an after market trunk mat on top of the existing one. I'm pretty sure this was with the rear seat in place. He estimated a 10db reduction, which is substantial.
Even with sound deadening the trunk will become an echo chamber for the exhaust and road noise from the rear wheel wells. The seat bottoms and backs make a tremendous difference in noise reduction.
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