Help Request - Running power outside car with switch inside

[Matticus91]

I'm working out a plan to do an exhaust cutout and could use some help figuring out the wire routing. Does anyone have any recommendations on ports/holes to use to get a line to the driver area for a switch, and then to a fuse box?

The cutout will be located right between the mid-pipes and the axle-back. So just in front of the rear axle and near the middle of the car.