I must admit im not a fan on the look of the VF intake.
Surely the only way this intake can make equivalent gains to the evoms/ITG/forge with a filter that is MUCH smaller, is by reducing the filtration to allow more air in. Maybe the filter material is of a better design, i dont know. But IMO the only reason the VF is needed is purely due to the 3" diameter of the MAF housing.
If i was tempted to go GIAC extreme route and currently had an ITG intake id be asking ANDY@ITG to knock me up a 3" MAF housing.
As you can see from this pic nearly the whole system is 3" anyway. It was designed this way to alleviate the extra air resistance that a constant diameter pipe creates in the 90 degree bends.
All you would need him to do is the MAF housing, a turbo/MAF housing silicone pipe and a connecter hosefor the right hand side. Plus id bet thios would be a cheaper option than buying a whole new intake if you want to go GIAC