My X needs new speakers and i was just wondering what the dimensions of the speakers are. I read somewhere that they are 6.5" in the doors, but at another page it says 5.25"?

Also, what setup would you guys recommend? I think i will keep the original Sub in the trunk for now, but will replace it later on... Will the original Amp do any good with new speakers?

I do not have the navigationsystem, will the headunit do?