James Lighthill

When an eighty-kilonewton jet exhausts gas at Mach two point five into ambient air, it creates high-intensity supersonic shock cell screech.

Using Lighthill's acoustic analogy for supersonic jets, Argon calculated the sound pressure level.

Five meters behind that Roadster on a city street, the exhaust noise exceeds one hundred and fifty-two decibels.

To put that into perspective, standard road-legal exhaust noise limits across North America and Europe are capped between seventy-two and eighty decibels.