Best way to route wires in a Regal

Hi All,

I was hoping for some feedback on the best way to route an Amp power kit, and the RCA wires in a regal. Ive done it in a monte carlo before, but it was a ... less than clean install.
Normally id just let bestbuy do it (I have free installs) but they don't have an appointment until mid January, and I am NOT waiting that long.

I ran the power wire through the wire boot that is on the firewall directly behind the ps pump. Passenger toward the middle from inside the car.

Maybe a little late here, but there’s a grommet that’s just under the brake master cylinder. It comes into the cabin just above and behind the ebrake pedal. Just had to jab a knife through it to make a hole for 8-10 gauge wire and fish it through.

I’ve read the hole in the firewall is meant for a manual trans clutch pedal that isn’t used in these cars so it’s just plugged up and empty.

I ran my power wire across the top of the firewall then down into that grommet, straight back along the bottom carpet trim into the trunk.