i traded in my 05 and got an 09 which i love. Mazda sent me an owner notification program about the base head unit with Sirius. when they do the change over if it doesn't work do this. some one else with camera ect can post this. now this old dude who doesn't understander electronics at all wants to know if knowing that i have a Sonya receiver can help me. In my 05 i just replaced the speakers with infinity's and a alpine amp with 10' speaker. sound was good. and much better than stock. i will have some else do this after reading all the treads ect. i can handle the back speakers but i not sure i can get those door done right. another question can i add tweeters in the back speakers even thought i have a base unit?