Pressure waves, harmonics, pulses of air molecules at the speed of sound - it was carefully designed to optimize airflow in the intake. If you take it off and de-snorkel you might be able to hear more happy sounds from the intake, but it was put there to make the car run better.
Here's the basics without all the formulas and dictionary words:
https://itstillruns.com/air-intake-resonator-do-12156112.html