My Brembo M6 w/ 3.73s went 12.9s bone stock. Zero mods. LOTS of wheel spin and hop. Running 12.5s now with ProCal tune and BMR upper and lower control arms in 2000 DA air. 12.4s easy with 0 DA.
I had gone 12.9 @ 111mph bone stock, full weight, 3/4 tank of gas. Was my very first pass in the car. My second pass I got a better 60' but missed 4th.
I think with more seat time I could have got a 12.5-6 @ 112mph.
I also went 12.6 at 112 in my bone stock 3.31 car. It was my first time at the track with it and the car was only a couple days old. With practice and a broken in car I can see people nailing a 12.4ish