the gas tank in the ls is located right behind the back seat, which makes it hard for bass to pass thru. what i did is take out the stock sub to allow air to pass thru & tap off those wires to run my aftermarket amp. you'll still need to run the power wire though. depending on your taste, you'll probably need a pretty strong amp if you wanna THUMP thump. i'm running a 2400 rockford 2 channell to power 2 12" JL w3 v2 d2's & it doesn't bang half as hard as it did when i had it in my civic... again, it depends on your taste. a bass knob is a pretty good idea as well, so that you can turn down the bass on your head unit & control the bass from your bass knob to avoid blowing your door speakers.