I drilled a hole in the top right corner of the firewall. There is a black cover from showing the bare metal, and there is this circle precut from the insulation. I just drilled out a whole from there, but ive heard there is a rubber grommet in the lower right hand side. I heard it requires to remove the panel under the fender. Do a few searches, running amp power for camry or something. Good luck.
PS to make it easy, just go under the search and search by username and look my name up. Ive for sure said something on that thread, might be easier to locate.
just drill a hole, a buy a rubber gromet. don't feed it through untill you have the edges of the hole sanded or youll strip the wire and be S.O.L. feed it throudgh the wall and remove carpeting and cusion from the drivers side underneath the pedals.
There is plenty of room where the hood release cable goes through, just punch a hole in the rubber that surrounds it, then go up through the white plastic ring on the back side of the strut tower. I fit 1/0 gauge in there, so no worries no matter what size you're running.