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Well - I don't know that there is too much different between 2008 and 2010. CCC and CIC on nav front for one - not sure if you have nav though.
But between M3 and 335 with jb4 that I can help with (mine was 135i with Dinan II)... the M3 is simply the real deal. The power is throughout. It's linear. The torque jump we had with the boosted x35 engines is gone, you'll have to relearn your off the line techniques.
Now my 335xi, 135i and now m3 are all within 1 year of each other so I can't really tell what's new. But from what I've read, other than the nav - not much.
Enjoy the new car, glad you got out of the Tbone. With a BMW it's expected, but still!
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