it's just a misnomer for an air horn as putting a venturii in an intake would be a bad idea as they only increase velocity within the are of the venturii once the air passes the venturii section and expands back out it is slower than it was before it entered due to the restriction upstream. It makes a good corporate buzz word though when selling an intake FEATURING PATENTED VENTURII VELOCITY ENHANCERS!!!! The only real place for a venturii is in a carb. Air horns just seek to guide the air's entry path into the pipe to reduce turbulence and increase flow so they don't cause restriction. It really isn't going to cause HUGE gains though. I'd wager that the top secret intake may have a different diameter MAF pipe and it is running much leaner than stock to account for it's power gains. That and foam filters aren't very restrictive because they don't filter well at all personally i fell that if you are running a foam filter you might as well just run a fine mesh stainless drag filter as they both just basically filter out the big chunks.
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