First, you start off by finding a place in your trunk to put your subwoofers. Place the box in your trunk with the speakers facing away from the back seat. When you open the trunk, your speakers should be facing you.
Next, find a place to bolt down your amp to your speaker box. This makes it easier to keep the wires from disconnecting every time you turn while driving. The best place is on the left side of the box. Use the 2 screws to bolt your amp to the box (one on the top corner of the amp & the other on the oppsite side on the bottom).
Then you connect the RCA's from the back of the stereo by simply matching up the colors(SEE PIC IN STEP4). Make sure to connect the remote wire(blue) as well or you won't be able to hear anything out of your speakers.
When you're done connecting your RCA's to the stereo (along with the other necessary wires such as the ones shown in the picture below), you run those wires down the back of the dash panel; under the steering wheel where the fuse box is; then under the carpet on the driver side all the way to the back seat. When you get to the back seat, take off the back seats and run the RCA's to the trunk. You can then put your back seats back on.
Connect the RCA's to the amp by matching up the colors(SEE PICTURE ON STEP 4). Next, take the black speaker wire (ground wire) and find a non-moving place to screw it on to. Before screwing it on, make sure you scratch that place with a screwdriver and then screw it on.
Finally, you run the 4-gauge power wire from the battery to the Amp(SEE PICTURE IN STEP 3).