Is that an audio jack in the glovebox?
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https://mbworld.org/forums/c-class-w203/81978-diy-setting-up-aux-input-ipod-mp3-player-etc.html
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For something low quality like a sat radio it won't make much of a difference over a good hard wired FM modulator (they are not all the same). Heck, I have sat radio built into my wife's factory radio and it's still mediocore compared to FM but in a Wrangler, once you get moving it doesn't matter.
For an iPod, it makes a slight difference, for example, if you can't tell the difference on the road between 128k and 192k MP3's then you won't be able to tell between the FM mod and aux-in.
https://mbworld.org/forums/showthread.php?t=81978
my wife's 2004.5 C320 SS came with the aux input.



Mine has been great, straight from the factory. Plug and Play. What's your beef with the 02?
