I have measured 0-60 2 ways. Using my Aeroforce gauge, I consistently get 3.99 - 4.09. The number in my sig is from using the Wallace racing calculator. It bases 0-60 off 1/8 mile time and speed. Since that number is in the range I see with the gauge, I feel pretty comfortable using it.
I have never had the advance track light come on at the track. The only time I have ever seen it was when I was deliberately trying to powerslide around on a snowy parking lot.
I am probably a wimp when it comes to brake boosting. I don't even start until the first yellow light comes on and then only to around 1800 so it is very short and mild.