Contact BavAuto.com and ask them if they plan on releasing a Infinity sub package for the 06 X3, I checked and they don't have one listed yet.

Also try out www.crutchfield.com, they should be able to give you ideas of speaker upgrades.

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We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.