Sniper EFI "Dual Plenum" Intake Manifold 102mm throttle body bore for GM LS1/2/6 engines (Includes installation kit, and fuel rail kit) Silver Finish; Holley continues to push the envelope of intake design with its latest offering. The unique look of this intake will surely stand out from the crowd! Our latest release of fabricated "Dual Plenum" intake manifolds for GM LS1/2/6 and LS3/L92 engines. This unique design of utilizing two plenums solves two common problems experienced with many intakes increased airflow and even dispersion of air to intake ports.