Blame Jeremy Clarkson and the car culture he fostered. For decades, new and old cars were judged by their ability to spin their wheels around a test track, and by the loudness of their exhaust heard inside a tunnel.
Also, here's some AI generated Top Gear to give you nightmares: https://www.youtube.com/watch?v=QYWCIJgw610
There's a balance to be had, and I would suggest neither Germany nor Austria nor the UK has it right.
We have more than enough bored cops that love to annoy people both on feet and on bike with red-light tickets in quiet areas. For pedestrians it's just annoying with a 5€ "fine", but for bicyclists or e-scooter drivers it means a strike in your driver's license.
I see you haven't visited the Netherlands, where what you're describing is even worse than the UK.
Even the super cars have to obey noise regulations. The modified cars can be 10-20dB louder, which is a lot.
0: choosing countries I’m familiar with