Generally on the flat exhaust flanges you want the thinnest exhaust gasket you can get (assuming your flanges are clean and flat). Adding thickness is band-air for another problem, or likely to be a failure point in my opinion. If you have a gap, something isn't flat, or something is misaligned. You may need to loosen the rear sections before tighten the front.
I'm running the gaskets from the FI, no leaks here. I personally don't see a reason to add a second gasket.
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