bmwmick...your link just confirmed what I said...the N55 is in the 35i and the N54 is in the 35is. My question to everyone was will this remain the same for the 2012 models (your link doesn't go into that)?
Also, bmwblog posted a ton of pictures of the new Z428i...some of which include the new color combo and engine shots from a few different angles.
http://www.bmwblog.com/2011/08/19/ul...-z4-sdrive28i/