Generally the 4runners are limited to 3 inches, unless you do a complete overhaul of the suspension with something like a total chaos Long Travel kit which only gives 3-4.5 inches of lift. Or you could do a solid axle swap... which I don't believe anyone has done on the 5th gen yet. SAS would be EXTREMELY intense build with many custom parts, and probably hundreds of hours of custom fabrication. Generally people here use spacers or new coilover combos to achieve 3 inches of lift. Our front suspension is Independent which has many limitation in what we can do.