In my experience, FM tuners are a really lame (if often necessary) solution to this problem. More and more, cars are starting to either have iPod-specific interfaces, or at least an "Aux" connection. My last car, an Acura 2004 TL, had a cassette player (!) so I connected the iPod that way.
From my experience, there just isn't a good FM tuner out there. It sounds like a transistor radio to my ears. Sorry to hear this may be your only way to link up.
From my experience, there just isn't a good FM tuner out there. It sounds like a transistor radio to my ears. Sorry to hear this may be your only way to link up.