We're picking nits, so I'm going to point out that Porsche claims the 911 Turbo S that they sell today does 0-60 in 2.8s, slower than you're suggesting.
I don't have firsthand knowledge to be able to say which of you is wrong.
Porsche is conservative with their reported 0-60 numbers. People that have tested it are able to get 2.5s. Look at the first two columns of times in the table here: