i have read several threads on ttrying to adapt the stock stereos in my model car to be able to plug in my iphone and run the music off of it

i do not want an fm transmitter of any type

am looking for something that plugs into the back of the stereo and i can run a cord out or whatever so i can plug in a headphone cord to it, or something like that

i realize there is the dension adapter that can be plugged into the cd plug in the trunk, and i can run wires back to the front
but i prefer something that plugs into the back of the stereo if possible
does someone make a kit that does this that is not an fm transmitter?

there is a lot of info on this but a lot of it is over my head

thanks for any info you can give related to this