Chris from HPF sent me a file, their car hit the dragstrip and ran a 10.1 @145MPH. Chris also ran the Vbox and hit a 5.12s 60-130! This HPF M3 is 4 second car for sure, that is flat out moving!
The 5.12s run was on a pefectly flat road with 1 shift, excellent job Chris and HPF.
Here's another program I use as well at perfdb.com, many here have used it too.
It reads the run in x.xxx, it does not round up the 3rd # like Performance of driftbox tools does, very cool program that anyone can use to get a quick look or validation of their run.