[HT1000]

Any modifications to the vehicle - per your warranty are a bases for BMW to decline warranty coverage on the area of the warranty impacted by the modification. Tires, wheels and springs would definitely allow BMW to decline warranty coverage on the entire suspension system.

Intake and exhaust mods would allow BMW to decline all engine/trans/diff warranty coverage. The mods do not need to be the cause of a problem to decline warranty. If you read your limited new vehicle warranty it specifically states that alterations can be grounds for declining warranty coverage. It's quite clear and people have warranty coverage declined weekly for these types of modifications.

The limited new vehicle warranty that BMW provides to you is for the vehicle in the exact specifications it was manufactured and delivered to you, not to some altered configuration, which is why the alteration clause exists in your warranty. Your warranty is a conditional warranty. If you want to retain the warranty then you can't altered the vehicle.