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Replacement factory Mazda "donut" style gasket for the junction between midpipe and muffler on the 2016+ MX5.
If you have a leak at this junction when you change to an aftermarket muffler, it is likely because this factory gasket has formed itself to the stock muffler's contour. Changing to a fresh gasket as sold here usually solves the leak.If you have over 20k miles on your ND, this is a good addition to your new muffler purchase.