Is your factory system baseline or the upgraded 7 speaker rear sub option? IF you have the upgraded system with a rear sub, you have to get a factory amplifier bypass kit as the factory amp for all audio is located with the rear sub woofer. Its a pain in the rear to bypass the factory amp. I did the install on my wives 05 4Runner sport V8 and added a rear video monitor. I agree with rockon, there is not enough room behind the head unit. I mounted a rear DVD player under the driver seat so the kids can have their own movies/sound. I have pics of the entire interior of the car apart if you