To replace the stereo in a 2003 Lexus ES300, you will typically need an amplifier interface that allows for integration with the factory amplifier and audio system. Here are the key components you may need:
1. **Wiring Harness**: A proper wiring harness adapter will help connect the new stereo to the factory wiring without cutting any wires. Look for a harness specifically designed for the 2003 Lexus ES300.
2. **Dash Kit**: An aftermarket dash