I know the reasoning behind people wanting rear speakers... needing more volume and, possibly, more separation of midbass and treble from the rear. I can tell you this... if you have a nice, quality front audio setup, tuned and facing the driver as much as possible, there really is no need for rear speakers (other than maybe a sub for extra bass, if you wanna!). In a perfect world, you would be able to aim the front mids and tweets how ever you wanted... finally aiming them in a spot that would sound great to front and rear passengers. In the stock setup you can get pretty close and still not need to mod the rear speaker brackets or frame for a larger speaker setup. I know... I effed up the brackets originally by putting in 5.25" speakers, then 6x9's... I thought I had blown them (Infinity Reference) and left them in for a long time... finally removing them, improving the quality of my front setup, and it made a HUGE difference!