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why would you want to change the nav thats already there??
if its a car that didn't come with nav and I'm sure u can find an in dash monitor to install....
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2009 M3 DCT
Matte Grills, Matte Gills, Paint matched reflectors, RPI scoops and filter, H&R springs, 18MM spacers in front, 15MM spacers in rear.
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