Re: New system for my 1999 Toyota 4runner
2 15's in a 4th order will not fit just behind the back seats, you have about 8 Cubes total and that will completely fill up the cargo area.
This is the back of my 97, the battery takes about 6" out of the space the box could use, my box is 7.3 Cubes, you may be able to squeeze a little more space out of it with Aero ports.
97 4runner, 3RZ, 5 Speed
Headunit: Alpine CDA-9887
Mids: CDT HD-6CF
Tweets: CDT DRT-25
Fronts Amp: Hertz HDP4
Sub Amp: American Bass VFL150.1
Substage: 18" SSA ZCON
Electrical: 160 Amp Alt, Duralast Gold, C&D270FR, 2/0 Throughout