My stepfather was a deputy sheriff in a SW state 40s-70s when he retired. Plain clothes, not unformed, for most of that time. His car in the 50’s was a plain Ford sedan equipped with a supercharged Thunderbird V8. Still chasing bootleggers then. In the 70s, it was hot Galaxies then a LTD all with with big block HO V8s and cop suspension, drivetrain and brake packages. His last car was the plainest nondiscript 70’Olds Delta 88 in existence. It was a factory hotrod 455 V8 with the cop packages.
I drove the Olds one time to the car wash. One the way home, a Trans Am pulled next to me at a stoplight and was zooming the engine at me for some reason so I hooked it up into a drag race. Blew the doors off the Trans Am then shut it down. As the Trans Am shot by me, I gave the Trans Am a couple of yelps on the siren. Bad bad bad of me but there you go.
BTW, my car at the time was a 67 Barracuda fastback.