http://afepower.com/shop/details_new...5L&&brandID=52
on the bottom of the page you can read that it clearly say that is 50 state legal.
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2005 z4 2.5i/// Aero front bumper, m rear bumper,08 rear lights, custom quad exhaust, matte black front grill, OEM alarm, llumar security film,m wheels, HID lights, LED interior and trunk light,Ipod integration, stubby antenna,tein s-tech springsx