Guys,

Got my 0 gauge installed today, and it fits almost like the car was designed for 0gauge.

It runs under the factory harness all the way to the back, neatly tucked in with no bulge.

NO DRILLING REQUIREED!!!!!!

just a huntch... you're gonna hafta xplain 0Guage Ricky... IOW Whachu tawkin bout Willis?...

He's probably talking about the 0/1 gauge power/ground wire for his amp...

I have a 4 gauge wire from battery all the way to the trunk... that runs my Alpine MRD-M1000 amp.

To the OP, can you please take a picture of the wire where you tucked it in around the back seat?

Ahh... I see... something that shouldbe in this forum:
https://g35driver.com/forums/audio-video-electronics-20/

where did you run the wire through the firewall? I haven't really looked, but i may eventually add a sub to our system

My car is a mess right now,

but i will try to post some pictures. The 0 guage wire was fed through that huge harness and rubber piece right behind the battery. yOu ahve to remove the plastic shrods out first.

Just make a slit in the huge rubber and then slide the wire through. It will fit, and then you seal it with some sealant.

as for the rear seat, i found some openings back there to feed it but i might have to redo it, because id dint remove the seat backs yet.

Make sure you seal the slit up good. On the older G35s (at least) the ECU was right under the grommet and water can leak in there and damage the ECU.

With epoxy?

I used a silicon based sealant, but epoxy should work

I have two sets of 0/1 gauge running through there, as well as probably 10 other wires for various things. I used hot glue to seal it back up, and have never gotten any water in the cabin. It's a great place to send wires through.