ACDelco 12603871 GM Original Equipment Lower Intake Manifold Kit with Tubes, Gasket, Bolt, Stud, and Pin Evenly distributes the combustion mixture (or just air in a direct injection system) to each intake port in the cylinder head for proper function GM-recommended replacement part for your GM vehicles original factory component Offering the quality, reliability, and durability of GM OE Manufactured to GM OE specification for fit, form, and function