Cometic Nissan RB25 2.5L Inline Lower Intake Manifold Gasket Air intake systems are a common first mod to many project cars. They are quick and simple to install while also enhancing the looks of your engine bay, the sounds of your engine, and the performance of your vehicle. Intake gaskets are used to maintain a good seal between your intake manifold and cylinder head. If you intake gasket is bad, your vehicle could be experiencing vaccum leaks. Manufacturer: Cometic Gasket Product Name: CG Intake Gaskets Part Number: cgsIR511060AFM All Cometic products are made in the United States with materials manufactured on American soil. Launched by four partners including current Founder and CEO Bob Gorman in 1989, Cometic.