Exhaust gasket

Ok so I was riding yesterday and my bike got real loud all of the sudden, almost instantaneously. It's got a brand new yoshimura exhaust on it. I checked all of the torque on the bolts on the header and everything is fine. I actually took the exhaust off to inspect the seal. I am guessing that the seal is the gold ring inside that goes to the header. I observed a patch of black soot at the bottom corner. Would this be the cause of that. I just cannot figure out why the ex would automatically become 5 times louder. People were looking at me as I went by it was so loud. The pipe still has the 94 db insert in it. HELP. Thanks.

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