Depends what the mods are. But basically those items that are no longer BMW are not covered by the warranty.
But I suspect what you are really asking is do BMW honour the warranty if the car has any modifications?
Providing the modifications do not directly contribute to the failure, then in my experience it is not an issue.
But I suspect what you are really asking is do BMW honour the warranty if the car has any modifications?
Providing the modifications do not directly contribute to the failure, then in my experience it is not an issue.

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