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Don,
Not to sound petty, but I haven't used any gasket since the first Cobra I built.
I use 3M's gold Hi-heat Silicone, or the same in black. I coat the headers only with a full coat, circling each tube. Instantly attach the sidepipes, let it cure for 24 hours and trim off the excess with a razor blade.
You can fire it up 20 minutes after the two parts are attached, I just give it the extra time to cure before trimming.
Hope this helps.....
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