[IDBMW]

A lot of it depends on your BMW service department. Some service departments tolerate modifications more than others. Bottom line is BMW has to prove the mod caused the failure so you have to deal with fighting them over warranty. Just ask the BMW service manager directly if a mod will void the warranty and you will have a good feeling of where they stand.

I do not understand how the BMW dealer can find say a Juice box and void the warranty with no failure related to the mod. My understanding of the Magnuson-Moss Act is a failure has to occur then the warranty can be voided if the mod caused the failure. Say I change my oil and use a Fram filter. Then take the car to the dealer for something and they find the Fram filter and void my warranty.

Again it’s how much of your resources do you want to spend fighting them on an issue and how tolerant you BMW dealer is of mods.