And to the OP, the throttle body you have is 83mm at the opening, then opens up to 87mm just before the blade, goes back to the stock blade and 80mm opening, and then opens up and tapers back down to 83mm on the back side. This is the best port configuration to get increased airflow and airspeed without causing any high idle codes.
As for the intake, have you reset your computer so that it relearns the new mods? If you did not disconnect your negative battery terminal before installing the new parts, then I would go ahead and do that. Just leave the negative terminal off for about an hour.
We have numerous customers that have dropped anywhere from .2-.4 seconds off their 1/4 mile times with the intake alone, so we know that it works. We have also seen consistant dyno gains as well. As someone that sells all the intakes available, the Vararam is the one I chose for my own truck because I know that it is the best performer out of the bunch.