Here's the V-3 Si-Trim centrifugal supercharger going into place. It features an advanced impeller design for ultra-high efficiency. Vortech engineers used data from the dyno and CFD (Computational Fluid Dynamics) computer analysis to refine the design of the blades and volute (shroud contour). Even small, incremental changes in efficiency can make a difference because they not only draw less power from the engine, but also produce less heat, doubling the impact. In simple terms, the air has to make fewer turns and there's less turbulence, so it's more uniformly compressed and more uniformly speeds up.