The design of the IPD Plenums improves intake air flow by replacing the factory plastic "T" style design with a more efficient, cast aluminum "Y" design. This “Y” diversion area of the IPD Plenums split and channel intake air flow reducing air flow turbulence and increasing air flow velocity. This superior design ultimately results in considerable power gains throughout both horsepower and torque curves. Performance is also enhanced with our uniquely dimpled interior surfaces which create improved boundary layers further optimizing intake air flow characteristics.