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The best bet on any warranty question is to consult a local attorney well versed in warranty law.
Second best bet is to read the warranty terms in your user manuals. They are very specific - BMW only guarantees the parts on the car to be free from defects in materials and workmanship. The warranty does (and should) not cover changes you make to the car that remove the original parts.
People will say that BMW has to prove that a modification caused the defect. That is technically true in the US (not sure about anywhere else). BUT...and this is a BIG but... do you really have the resources to fight BMW over this? They have an army of engineers, experts on the car. What do you have on your side? The internet? SEMA? Realistically you lose that battle because you can't afford to fight it. So while the argument is technically correct, it is also largely irrelevant.
Here's the bottom line - assume ANY mod you do to your car may void the warranty on parts in any way related to the mod. If you can't afford, and are unwilling, to pay for subsequent repairs yourself, don't do it. Mod responsibly and with integrity and don't try to cheat BMW into paying for repairs necessitated by your modifications.
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