[Bryan2230]

It sounds awesome. It was a very nice increase in sound quality across the board. I think XM radio obtained the greatest noticeable increase, but my iPod hooked up sounds ridiculous. I could close my eyes and imagine being at a concert. There are two downsides of this system, the elimination of the pass through, and the loss of probably about 3 square feet of trunk space (11" from the back of the seat, 2' long). I would recommend the Factory Sub to anyone who doesn't utilize the whole trunk, ease of installation + sound quality = WORTH IT!