I've read the threads out there on scion head units. Here's another question.....I just bought a 2003 4r sr5 with the stock non-jbl stereo. Will these scion stereos work in an 03??? What model numbers do I need to shop for?? Are there any model numbers I should stay away from?? I would like to be able to customize the greeting on the screen so it doesn't say "scion". Thanks for any help. This forum rocks! Glad I found it!