I have an 07 IS350 w/out ML and was curious which is the best and easiest method to watch DVDs.

I'd like to be able to use it while driving and also don't want to lose anything I currently have, such as XM.

 

Get the Nav-Tool kit in the Vendor Section. Then you just have to get an aftermarket DVD player and you are good to go. I would also tap that and place monitors in your rear headrest while you are at it. There is also a DIY thread for that in the 2IS section also. Very easy to install