It probably has what’s called a valvetronic exhaust which when engaged, closes partially thus muting the overall sound. When the valve is opened, more sound comes out. This is extremely simplified, however fairly accurate. Race cars generally don’t have any mufflers as they restrict airflow and if you are tuning a high performance engine, you want the least amount of airflow restriction possible. A free flowing exhaust allows more air to exit at once, thus allowing more air to enter at once. Does that make sense?
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