This is my first post in this forum so my apologies if this is the wrong section. If this belongs in a different section, please let me know.

My wife drives a 2003 MB E320 that has the factory radio installed. No navigation, no SAT radio. I normally install plug and play Sirius radios in our vehicles using the existing head units (either using direct audio inputs, FM Modulators, etc.), but I've been struggling to figure it out on the Benz. Using the FM transmitter sounds like garbage, so that's not an option. I'd like to get Sirius/XM installed for her for Christmas so I'd like to reach out to the group to see what options I might have. I'd prefer to install a plug and play radio, but I'd be willing to replace the entire head unit if it's not crazy expensive. Basically, I'm open to any suggestions you all might have.

I can provide some pics of the existing head unit if that would help.

Thanks in advance!