EXHAUST LEAK

I just put on my new carbon fiber scorpion slip on yesterday and it leaks at the flange. I'm pretty sure this is do to the old stock side of the flange. The stock side is really think and not near as rigid as the slip-on side. It leaks a little between the flange, what should i use to seal that up. Should I try to make a gasket, or use some type of silicone or something?



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