It's important to remember that no single modification will void the entire warranty. Certainly, if you replace the suspension and try to get control arm bushings replaced under warranty, BMW will not cover it. But if you replace the exhaust and have issues with your iDrive unit or even your engine that is clearly not related to the exhaust installation, BMW cannot refuse warranty work. It is the dealer's prerogative to prove and explain to the customer that a modification is cause for warranty denial.
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