I have got my 05 XJ8L around 1.5 years ago and has been thinking about getting Aux in for my car since then. I know there are two existing ways to add aux in for the X350: One is to use a FM adapter and the other is to modify the CD player. After doing some research, it was found that there are cassette player for the X350, so I bought one, then get a cassette to 3.5mm adapter for it.

Just share with the X350 owners who have been looking for an Aux in solution for our car. Cheers!

 

I've been running the Jag Audio Connectivity Module in mine for a decade, after having it an X-type for a few years. I think it's a great option for controlling devices from the factory headunit/steering wheel controls, but any more they're difficult to come by, can be expensive, and are pretty dated technology wise. I'd be interested to hear what other newer options are available while keeping the factory headunit.