Amazon.com: Kinivo BTC455 Bluetooth Hands-Free Car Kit for Cars with Aux Input Jack (3.5 mm) - Suppo
I was having a lot of problems with the headphone jack into aux approach. Lots of whine and hiss. My car has BT connection for phone, but not for audio (which came the next year). Upgrade module is crazy expensive. This saved the day. I connect to both th...