Originally Posted by Bakerman
I am using it in a Chrysler 300C and the sound quality is the best I have heard through a tape adapter.
Well sure, it's a decent tape adapter, I didn't mean to say it wasn't.
Just saying that if possible, an adapter that runs directly into the head unit is going to sound better than a tape adapter can (either built-in iPod support, a line in, or CD changer connection).
I haven't tried it, but I've heard that the devices that connect between the antenna cable and the radio (basically, a hard wired FM transmitter) sound better than cassette adapters or wireless FM transmitters too.