It is no coincidence that the valves typically open in “sport” or “race” modes and in “street” mode the valves are closed.
I don’t know if this is well known, but Lamborghini has a track record of loud exhaust, period. Regardless of valve state. Huracan Performante owners requested that Lamborghini make the next special edition a little quieter. Reason being the Performante was too loud even on race tracks. Track day drivers know there are noise limits that vary by track. You’re asked to leave immediately if you exceed the limit. You may also receive a temporary ban and/or fine.
What did Lamborghini do? Make the Huracan STO even louder across all driving modes. The company demonstrates it believes noise limits themselves are annoying. While I do like loud cars myself, sometimes a noise compliant normal or comfort mode doesn’t exist.