Corksport is a great vendor, he's nice. I have no beef with him. I do mind all of the people who are buying into snake oil, though. If he wants to put a 2 on a dyno, that's fantastic; he has the means to do so and it's helpful to the community and he can be seen a valuable resource.
However, let's take a look at what I was saying and take a look to see what a dyno would show:
I am going to take the premise "Adding an extra/external ground to the throttle body will improve response time." Response time is a
function of time, I am willing to go along with the hypothetical that it
will improve response time. That is my assumption for this individual case.
A dynamometer measures force, the moment of force (torques), or power.[1] The power output of any given engine has a lot of parameters; however, it can essentially be boiled down to Air vs Fuel mixture at a specific frequency of time in relation to the motor (RPM). So at any given RPM, depending on the amount of air and fuel a motor can take in, an engine will produce a specific amount of power. This can be altered (positively or negatively) by changing certain parameters, for example: switching out an air filter to one with more surface area has the potential to move more air into the intake. With more air entering into the engine, you can add more gas; therefore, more power.
The throttle body on a car has a maximum limit of how many units of air it can move over time; it has a specific size and only so much air can enter it when it's fully open. This will not change with relation to the time domain. Ever.
How does this affect the power output? It won't. The power out has the potential to come sooner in relation to time; however, it does not have the potential to be affected by the time it takes for the throttle body to open. It is an apple and oranges comparison. The throttle body's size doesn't magically change when a ground is or isn't added. It's the same throttle body. I am more than willing to put money on the fact that power output will not change with a grounded throttle body.
Lastly, I'd like to thank Rockin03MP5 for not taking the time to think about the physics involved with grounding a throttle body and not having tangible proof that grounding a throttle body will change something. I am sorry that you feel that re-creatable processes has no place on this forum.
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[1] - Wikipedia: Horsepower
http://en.wikipedia.org/wiki/Horsepower