Quote:
Originally Posted by steve_biegler
Does anyone know what the button in his left hand is?
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I didn't even notice the button when I watched the video the first two times.
(Props for your powers of observation.... 
)
I had to do a little digging but based on what I've read I'm betting the button in his left hand is for nitrous. Here's an excerpt from an
article about the event:
It should be noted that the bright white Stingray that John Hennessey piloted down the Texas highway to 200.6 miles per hour was also equipped with a nitrous oxide package that is not included in the HPE600 C7 package so those looking to go 200 miles per hour in their new Corvette might need a little more than just that HPE600 setup but I would expect that the folks at Hennessey would be happy to sell a nitrous setup or at least point customers in the right direction.
I don't know much about nitrous but I'm guessing a person could empty a tank pretty quick if they're trying to accelerate from 150 MPH to 200 MPH.
Given that a stock 2014 C7 is good for a top speed of 192+ MPH I'm a little surprised Hennessey decided to use nitrous for his 200+ MPH run - maybe he needed the extra power because the course was relatively short?