Audio in the G20,using the stock BOSE:

2 (DVC 4ohm) Rockford Fosgate 12" P3 Subwoofers in sealed box wired down to 1 ohm.

4 ga wiring for power and ground

Hifonics BXI Brutus 1206D Amp (1200 @ 1ohm)
Audio in the Sentra:

2 (DVC 4ohm) Pioneer Premier 10" TSW1007D Subwoofers wired into 4 ohm load

Pioneer CD deck 50 X4(Yes,behind the McDonalds shake lol)

Infinity Kappa 202A Amplifier (600 Watts @ 4 ohms bridged)
No pics of the replaced speakers in the doors and rear of the Sentra,not need,just cheap factory replacements.Shooting for some front components this summer.