For the last 22,000 miles, I've thought of my E90 335i with S2 software as fast but very well composed. Turns out... if I hold down the DTC button for 5 seconds (instead of just toggling it on), this little beauty becomes a bipolar beast. It reminds me of my 2 year old at church when he gets a little glimmer of naughtiness in his eye while he works through what bad deed he is about to commit. He looks so gentlemanly, and then, all hell breaks loose. I've never driven a car that would break loose at 40 - 45 miles an hour. I drove the 335d recently and it wasn't even close (with 400 or so ft lbs of torque). How nice. Now back to cruise control and a lot of highway miles.