Yes i do have a sub, and as much credit i'd like to take for it. I did not install it. Installation was paid for. The box was put under the whole rear bench seat downward firing sealed. Is one 12" enough? Yes it is, for some. I wouldn't mind more thump, but I am content and not looking to upgrade anytime soon. Sound quality? Superb, with the 400-4 powering the mids and highs, I hear the highest of notes. The Sub provides great lows and nothing ever too boomy. Hope it helps, good luck on your decision.
I noticed that you have mounted a sub in your truck. I was curious where you put it. I was thinking that if one sub was enough I might try a mount inside the storage compartment between the front seats. I mean the lockable lower compartment. How does your sound?
I went with Silverstar Signal bulbs. Its got a chrome tint to them when they are off, and glow amber when turned on. I will have a picture up shortly.