It is all about the driver and power band. Dansrt did 11.9 on stock turbo and less than 300 whp.
I am probably about 320 whp and can only get a 12.3.
So it depends. If you are GOD, then you can get a 11.9, if you aren't plan for somewhere in the 12's or 13's.
Definately invest in some DRs or Slicks.