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Finally got to try the speed corrector, it won't work on a 09 M3. The velocity comes on a buss line. So there is no place to splice in the ERA. Put the 19" tires on and speedo is about 1.5 to 2 mph high, what I've been seeing since the beginning. The funny thing is the odo reads in my favor as far as warranty would be concerned. Soooo I have to live with it. When I go on a really long trip this summer I'll get a better idea of the odo error but it is pretty close with the 19" tires. Put on the matte black grills, side gills and M3 badge and it makes a nice addition. It would look good on your white M3 too.