Q: Exhaust gasket continues to blow

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I have a 2008 mazda 3 i sport 2.0l 4cyl and i put a full cat-back exhaust on it, and aftermarket headers. the header is a two piece header and the gasket between the header and basically the down pipe has blown a numerous amount of times, i have replaced it several, but nothing seems to work, thanks

My car has 55555 miles.
My car has an automatic transmission.

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