The speakers or door subs on the passenger side in my 08 GT are starting to buzz like their starting to become blown out. Right now I want to replace the speakers and subs in the door with something better. In the future I will be adding a Pioneer F90 or similar, and maybe a sub in the trunk with an amp for it I have the factory navi right now so I assume it's the shaker 500 setup with that but I'm not sure. I'm not looking for a huge improvement in sound yet...just want to get rid of the buzz when I listen to my music right now.

My questions are:

Should I be replacing any of the wiring or the factory amps right now if I only do door speakers and subs?

Does anyone have opinions on these speakers?:

http://www.amazon.com/Pioneer-TS-A68...=1RMU6V71QT8C6

These are the subs I'm going with since they will look like factory with the grill when installed:

http://www.amazon.com/Pioneer-Premie...=1RMU6V71QT8C6