Warranty is a fun topic here. Outside of cosmetic the warranty claim is going to be up to the dealership if they can prove your modification was the cause of any issue. You can find plenty of articles about the reliability of modifications, etc. Your intake, stereo and exhaust are pretty harmless. If you're looking for power add-on that ford performance tune is gonna be your jam. Keeps warranty, installed from Ford and comes with their stamp of approval. Its mild by comparison but keeps you safe (relatively) from anything crazy.
Search around and you'll find tons of information on everything you've mentioned. Welcome and happy modding!