So theres people that have tried?wongpres said:No one has been able to do it on any of the new-gen Mazdas (e.g. Mazda6, RX-8, Mazda3).
Archel said:Wouldnt it be really cool to change it to Welcome (your name here).
that would really feel nice, specially when a chick notices it shotgun.
BrianG said:Just get an aftermarket deck so you can use the installation kit, which includes an extra pocket. Then mount an LED sign into the pocket and program it to say whatever you want! Something like this: https://www.ebay.com (commissions earned)
Even though it says it is 10" wide, the electronics are probably small enough to fit in the pocket (judging by the size of the working part of the sign) so a little custom panel and you're done.