I have a 2005 Jeep Wrangler with a 8" marine bazooka sub. It sounds good, for a TJ Jeep Wrangler, but curious what if I added another. How much difference would it be? I have a amp that that pushes 400 watts 2 channel. And the 1 8" Bazooka Sub handles 150. Would it sound a lot better with 2 (facing each other behind back seat or facing away from each other), sound a little better, or be the same but sound will travel farther with 2 subs pushing?