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Originally Posted by ChevyHighPerformance
For the new Z06, GM designed a cutout, so when you went to WOT (which does not have noise requirements) the cutouts opened for more power and substanially more noise.
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Unless the noise standards have changed recently, auto manufacturers still have to meet a 50' full throttle noise test. The cutout is just to make the interior noise level liveable while cruising.
Michael