Thank you for the response.

Both the car and the truck are pretty quite, the coupe has a turbo muffler behind a cat, and the truck has a glass pack behind a cat, both are 3" exhaust. Both have 12 volt modern electronics (both are EFI).

The only smart phone here is my wife's. I have an old flip phone. Adding another smart phone is $75/month, is there another option? I sort of comprehend a bluetooth amp, could you please clarify? Pretend I know nothing and we will probably understand each other...