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Ask your local dealership what their policy is for air cleaners (or other mods) voiding warranties.
Some dealerships will install your aftermarket bits, and others are risk adverse.
K&N cold air filters are CARB approved and provide a sticker/registration number for smog inspectors to record and enable passing inspection . How a dealer or warranty provider feels may be different.
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Sold 2011 Z4, kept 2002 M3
PM for various e89 parts 4sale.
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