I have seen and heard of these other fuel saver devices, but that isn't the purpose of this. This is down stream of the AFM (Air flow meter) and is said to help the turbo do its job easier. Air after the turbo and once its gone through an intercooler is going to lose any vortex in terms of...
Benefit of a "Vortex Generator" in a turbocharged automotive applications
As the title states, What is, if any, benefit of creating a vortex in the air flow prior to it entering the turbocharger.
Here is a photo of the "Vortex Generator" in question...