Originally Posted by Cal_Cobra
PS - Being that the amp is 2ohms, if you change the door speakers to 4ohm speakers and keep the factory amp, you've lost half of the power to the door speakers (although the amp will be happy doing half the work

That's a very valid point. One will have to consider if the OEM amp will provide the sound levels one wants before a replacement speaker is chosen.
Thanks for the dose of reality!