i should also add you shouldnt need a gasket in that location as there is no real pressure to speak of in that location (post turbo) but if your flange is warped you may need one.
i have 2 v-band clamps NO GASKETS on my 4-in exhaust currently with no leakage although i made sure that one of the pipes slips into the other band flange by a minimum 1/4in to help in sealing.
z
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