The V-Ductor is the velocity stack that fits inside your air cleaner By funneling air through the unique and proven venturi design, the V-Ductor reduces turbulence while increasing Velocity for optimal fuel mixture The V-Ductor performs like a velocity stack with the advantage of installing inside your air cleaner Bolt-on performance you can feel The only device of it's kind CNC and laser cut from 6061 billet aluminum Designed to install inside your stock or high flow air cleaner