In my case when I was FWD, it ran 12.9 with winter tires on a crappy track.
On the street I'm faster by at least 2 tenths, I can launch harder with more throttle. I run it the same on the street and drag I only remove the passenger seat which makes a negligeable difference.
But I don't street race much, not worth losing my permit. If I do it will have to be a great occasion (once I have the twin engine ready vs a Viper or other exotic)