What the quality of K&S gaskets? They are cheap on fleabay.
K&S Gaskets are automotove approved "die cut paper gaskets" and will work just like the OEM gaskets.
The Cometic gaskets are the next level up (Aluminum - Foam Material) The AFM is a chemically blown, compounded nitrile synthetic rubber bonded to an aluminum core with temperature resistance of over 250F. AFM material has an 85% recovery while maintaining strong torque retention. AFM does not require gasket sealers or re-tightening.