Will installing front/rear lip bumpers void warranty, if screwing into bumper?

What do you mean, exactly by “void my warranty”? The warranty on the bumper is toast, obviously. Also the wiring harness your screws drilled into LOL. But your powertrain warranty is fine. Magnuson-Moss Warranty Act says they can't void the warranty on anything unrelated to the modification.

Yeah I guess it was too much of a general question, this is my first car so I don’t know what I don’t know. I was just curious if I had added aftermarket parts (that required drilling or stripped off the paint, or impacted the car cosmetically in any way), could the Tesla Service Center / Support use it as grounds to deny me service for anything under warranty (whether it’s bumper related, software, battery, whatever)?

Current US warranty law says you as a consumer can do whatever you like and the warranty must remain intact unless what you did was the actual cause of the damage. For example, if you start drilling into your bumper and you destroy a wire or sensor in the process, that repair will not be something you can claim under warranty. In that same scenario, if you find that your side view mirror has a motor that burns out, that will be covered under warranty as it's not related to your action on the bumper. I hope this helps you in making your decision!

Automakers used to try that. Unfortunately they tried it on Mr. Magnuson and Mr. Moss, who later became senators, and that was the end of that!

I just installed a Maxton lip and rear diffuser on my ‘22 Performance. I still have two years of warranty left. As others have mentioned, Tesla needs to prove that the mods you did led to the failure of whatever part that went bad. If the screen on the inside of the car goes bad, that has nothing to do with the lip on your bumper. As a VW owner, the VW dealers have been trying to “void” the warranty over any modifications done to the cars for years.

In regards to those quoting you Magnuson-Moss, just understand that it is not the magic bullet they always make it seem like. Tesla can totally come up with some BS excuse to try and avoid covering stuff under warranty and then it will be up to you to take them to court to make them prove it.

in europe Tesla is mildly goodwilling in overlooking any commander or little mods to the car, its a byproduct of the master techs being relatively young here

Read somewhere that the battery and drivetrain were voided by lowering the car or using third-party suspension parts. These parts cause stress in the other warranties than the initial 50K warranty. Tesla even look in facebook, etc to see if the car is still stock.