I dont buy it.. I'm sure these numbers are with the hood up and a large fan blowing air at the filter.
Put the hood down and drive down the street, breathing through the shitty factory snorkel and it wont make that power.
Also.. velocity stack smoothing air into the factory rippled tube? I could understand if they changed things around so that it was a straight shot to the manifold.
I bet you can put a k&n drop in filter with an open box and make similar gains, if you were to dyno the same car/day back to back.