okay, to listen on your computer get foobar2k:
http://www.foobar2000.org/
find & install the FLAC plugin, then (hopefully) you will be able to play 24bit files on your computer.
there is a free wav editor called audacity
audacity.sourceforge.net
go to preferences and look in the export settings, set it to 16bit 44100Hz (this is "cd quality"). make sure the dither is on highest quality. convert the files by loading from wav, then resaving to a new file with these settings. you will be able to burn an audio cdr for your car from the resulting wavs.
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