Yes it is possible.
Assuming you do not have an Aux input, you have two routes you can use.
The first is buying a little FM transmitter for your IPOD. That will transmit the music from your ipod over a given frequency. You tune your radio to that requency and you listen to that music. Generally however, this option really sucks. I don't recommend it.
The second option is similar but instead of broadcasting the frequency over the air, you get a little device that inserts between your antena and factory head unit. You still tune your radio to a specific frequency but now the signal is being injected directly into the head unit antena input. This works MUCH better.
Any car stereo place can do this for you easy.
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McIntosh Head Unit
Diamond Hex Comps (front)
No Rear Fill
Precision Power PCX-2125
Precision Power PC-1800
IDMax 12d4 v3
Audio COntrol EQT x2
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