Ok nevermind.
I asked the writer of the article what year the car that was tested and he said.
"You bring up a good point, the numbers we quoted for the 335i (Car and Driver) were from 2007. To the best of our searches we did not find any test results on the updated 2011 model sporting the N55 single twin-scroll turbo. While BMW claim identical power output from both engines with a 10% increase in efficiency in the N55 – we do not know if the 2011 will be as quick. Unfortunately, we are not (yet) setup to perform our own reliable testing to find exact numbers. In the future, we aim to bring you our own independent testing numbers."