I am pretty pleased overall. Bang for the buck its a great upgrade. Is it audiophile sound quality...no.
However, it does improve the JBL system dramtically and suits exactly what my needs were. Retain factory HU and stealth. With the removable box in it bumps pretty good.
I would definitely...
The remote gain comes with the amp. The sub fits perfectly fine, you will just need to cut the ribbing as described.
The old sub is a dual voice coil. The JL sub is a single voice coil. So you will only need to wire one pair to it.
If you are talking about tapping into the speaker wires for...
The speaker wire tucks neatly under the back seat when I remove the sub box.
The remote gain is perfect in that spot. :) The loose wires in there are actually for my Garmin Nuvi and the iPod adapter.
I got around to the install today. It took me the better part of the afternoon to get everything installed and tuned correctly. I also installed a USA SPEC PA15-TOY iPod adapter while I was at it.
In addition to the JL 8" sub in the factory box I also wired up a JL Audio 10" sub enclosure I had...