I have purchased a set of full length mad dog headers, Mark the owner told me "gaskets are not needed just a small amount of hi-temp silicone to seal them" when I told this to the mechanic/buddy who is helping me with car, he looked at me like I was crazy and said that he had never really heard of people doing that. I told him well that is what the owner/maker of em told me....so I don't know. Any people on here used mad dog headers, and what did you do....gaskets? hi temp silicone? ???