What do i need to put a pioneer stereo in my 2005 Highlander with the Factory JBL in it now?

To install a Pioneer stereo in your 2005 Highlander with the factory JBL system, you will need a compatible wiring harness to connect the new stereo to the vehicle's electrical system, an adapter for the JBL amplifier, and a dash kit to properly fit the new unit into the dashboard. Additionally, you may need tools like a screwdriver and wire strippers for the installation process. It's also important to ensure that the Pioneer stereo is compatible with your vehicle's existing features, such as steering wheel controls, if applicable.