Fm Bluetooth transmitter is the way to go and much more seamless. No need to fumble with cords at all and it reconnects every time you start the car. The sound is fantastic too. Some sound tinny but this one sounds great:

https://www.amazon.com/VicTsing-Bluetooth-Transmitter-Wireless-Adapter/dp/B01DDPUQTS/ref=sr_1_2?ie=UTF8&qid=1486689446&sr=8-2&keywords=B019BZ1XZ0%7CB01DDPUQTS%7CB01K7OHDKS

I have an 03 coupe with no AUX and this made a huge difference https://www.amazon.com/dp/B01DDPUQTS?