I’ve got a ‘10 premium MT and have had one of these for 7 years now. It just works with no frills. I have the microphone puck stuck to the utility pocket under the armrest, the ff/rwd buttons are backwards, but I got used to it. My iPhone and Apple Watch are paired. The armrest cla is switched.
https://www.amazon.com/dp/B00RH29CJO/ref=cm_sw_r_api_i_KDJG4NGN069NJ0DZYM1C_0?_encoding=UTF8&psc=1
I'll trump you (no pun intended) on this. Works great with the same setup in my 2012 CTS. http://www.amazon.com/SoundBot-Bluetooth-Hands-Free-Wireless-Streaming/dp/B00RH29CJO?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_detailpage_o09_s00