I've been thinking about doing this on my car for a little while but might wait until its more agressive. I'm planning on either doing matte black, white, or doing matte clear. I'm leaning towards just doing the matte clear cause it would make the car look like BMW's frozen grey color. You could probably PM some of the guys on here that have dipped their cars if you have any questions. Here's one for example:
http://www.e90post.com/forums/showthread.php?t=697179
http://www.e90post.com/forums/showthread.php?t=723698
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E90 335i xDrive 6spd, Nav, Prem, Cold Weather, & Sports package - Msport Conversion
Mods: JB4 + MHD, Doc Race ST, Pure 6266, AD-Eng PI/Mounts, Fuel-It st. 3, Custom Exhaust,
Tuned by TwistedTuning
More Pictures: Build Thread ///
683AWHP/675AWTQ