Thanks for the replies, I do completely understand that I won't be greating very high SPL in low frequencies. I am a very big HOME audio enthusiast and have done alot of testing with different drivers/cabinets in both LF's MF's and HF's. I have little experience with car audio other than I replaced the speakers and HU in my 03 Mazda 6, but that was much simpler because I wasn't using the stock head unit. I appreciate the info though, it's helpful.
I've done alot of reading around here on people explaining how to wire in an aftermarket amp to power the front 6 speakers while keeping the stock HU and steering wheel controls. (I am thinking I would just bypass the 6X9's in the rear deck for now.) But did not quite have all my questions answered and some left me confused. I have a McIntosh MC420M that I am hoping to use, what do I need in order to accomplish this setup = Stock HU+aftermarket amp for door speakers+tweeters ??
Thanks