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^^^ that is mostly because of the strict decibel ratings for new cars. Not just for the exhaust, but also for induction. That's why the frs has a tube that pipes intake noise into the cabin. You can hear it as a driver when you floor it, but outside the vehicle stays quiet.
Same theory for the m5 and having the intake/exhaust play through the stereo. Most new cars have some sort of similar setup
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