Sub (Page 1/1) zoomie_gt SEP 19, 08:12 PM So I’m currently in the process of adding a subwoofer to my 1986 GT, but I haven’t found a good spot to pass the power wiring through the firewall. It’s 8 gauge, so it’s not tiny to try to squeeze through. Anyone have a good spot it can come through with a minimum (preferably none) of cutting? Thanks! 82-T/A [At Work] SEP 19, 08:22 PM quote Originally posted by zoomie_gt: So I’m currently in the process of adding a subwoofer to my 1986 GT, but I haven’t found a good spot to pass the power wiring through the firewall. It’s 8 gauge, so it’s not tiny to try to squeeze through. Anyone have a good spot it can come through with a minimum (preferably none) of cutting? Thanks! Couple of things that we need to know first: 1 - Your battery is still in the factory location, right? 2 - Where are you planning on mounting the subwoofer... in the factory spot (under the passenger side dash)? zoomie_gt SEP 21, 07:50 PM Battery is in the factory location for the 86 GT. The sub is just a little underseat one mounted behind the passenger seat. Previous owner pulled out the stock sub when he installed an aftermarket head unit, but I’ve already got all the RCA run. I can run the wiring to the driver’s side and through the firewall behind the airbox if there’s a good spot there. 82-T/A [At Work] SEP 21, 10:12 PM quote Originally posted by zoomie_gt: Battery is in the factory location for the 86 GT. The sub is just a little underseat one mounted behind the passenger seat. Previous owner pulled out the stock sub when he installed an aftermarket head unit, but I’ve already got all the RCA run. I can run the wiring to the driver’s side and through the firewall behind the airbox if there’s a good spot there. Honestly, if you're just looking for power, you can drill a hole into the rear firewall... just get a rubber grommet to feed the cable through for water / noise, and you should be fine. There's nothing between the firewall and the inside. Just make sure that where you're drilling, you're not drilling into the coolant cross-over pipe or the wiring harness or something.