I remember some friends talking about motorcycles, and one was wondering how much horsepower you could get out of a Harley Davidson motorcycle.

And another friend quipped, "You don't tune a Harley for power, you tune it for noise!"

Back to tuner cars, I've always thought the perfect invention would be a tuner-car-audio-experience-device.

Basically, a device that you plug into the cigarette lighter and it uses some method of figuring out the engine RPM (and maybe throttle position). Then it would generate cool engine sounds and send them to bluetooth stream / fm broadcast / audio jack, for the car audio system.

You could drive a quiet car, but inside it would feel like a formula one car, a 12-cylinder italian car, motorcycle, tugboat or jet fighter.

I would say spaceship, but those days are gone since every EV nowadays sounds like an cheapo alien orchestra already.