Next was the dash switch install - pic #1. That was even easier. I took a small flat screwdriver and popped the blank cover. Behind it was the plug for the switch. Just plug it in, push the switch in and you're ready to go.
The guy I bought it from was using the lower cover and screws for another aftermarket sub he was placing in there. As a result, I had to order the cover from the dealership - pic #3. So that is the final step.
The sub does make a very noticeable difference but only for the lower bass frequencies. If your music contains mostly treble and a little bass, then the sub is not noticeable since any bass that comes out goes through the large speakers in the front. But when you do have a song with lots of bass, this sub kicks in and rumbles. Many times I have lowered the volume since the sub was overpowering. Sometimes even having to lower the bass through the head unit or switching it off altogether. I've had other stock and some aftermarket systems that did not compare with the loudness of the FJ system w/ sub.