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What gasket do I use between the header and cat back? The stock exhaust has that ring gasket and the header does not it leaks really bad
I just bought the same header also, and I am having the same issue. I will be going to the local parts store with stock header pipe to find a gasket that will line up with the header and the cat back section.
 

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A regular flat flange gasket should work. Measure the inner diameter and I'm sure a local parts store would have it. Think this should be it:
https://www.good-win-racing.com/Mazda-Performance-Part/21-1007.html

I'd check with Goodwin though. I had a Raceland header on my last two Miata's but the last had a custom vband and the previous NB was over 5 yrs ago but pretty sure I used that gasket(or similar).
 
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