Prolly not that much different that the 2.5 Duratec standard intake. The only real diffence is there are not two different length paths to each cylinder with this intake. I.E. both paths to a given cylinder are nearly the same length.
With the 2.5L Duratec intake, both paths to a given cylinder are a different length, and looking at a single bank, each cylinder has a different length from the TB to that cylinder.
However, the turns and bends may not be as abrupt in the standard 2.5L Duratec intake.
Of course, if you are going to build something that nice, I'd expect it has been flow tested just a bit.
TB
