Assuming you have already purchased your subwoofer and just need help installing it, here are the steps:
1. First, remove the negative battery terminal to avoid any electrical shorts.
2. Next, using a panel removal tool, pry off the access panel in the trunk area to gain access to the spare tire.
3. Once you have access to the spare tire, remove it and set it aside. Now you should see the factory subwoofer mounted in the opening.
4. Using a drill or screwdriver, remove the four screws holding the factory subwoofer in place. Be careful not to drop them into the hole!
5. Now that the old subwoofer is out of the way, it's time to install your new one. Simply reverse the process from step 4 - use screws or bolts (whatever came with your new sub) to attach it securely in place. Be sure to test it out before putting everything back together!