RE: Oil Changes versus Service Appointments/Kicker Sound System
Since it's using Mobil 1 I would do what the manual says, unless you just feel compelled to give your dealership more money. If you switch to a standard oil (non-synthetic) then do the 3000 mile oil change. As long as you are following what the manufacture recommends you are good to go. Can't help you on the kicker sound question. I've got it in my car too, but I haven't messed with it much.
Hope this helps.