I have a 99 4Runner. I think I can fit 6.5-6.75 in the front and maybe 5.25 in the back(i have read differing things about that). I have been looking at doing an all Pioneer Premier system, with components in the doors and either 10 or 12 in subs in the back with two PRS-X340s pushing it all. I am open to any suggestions. My budget is in the 700-900 dollar neighborhood, I am gonna stick with the stock head unit for now. Thanks