16.2 for the hemi? that sounds wrong.
I think we're used to seeing numbers like 11s and 12s for fast production cars. Those numbers, of course, are lies.
A car that can do the quarter mile in an honest 15s is a fast car. Not the fastest, perhaps, but fast.
The thing is, if you buy a 12s car from someone and take it to the track, it will take more than 12s to get through the run. Much more.
The only time the numbers are valid is if two cars are tested at the same time on the same track using the exact same techniques. The resultant numbers are just a reference.