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The cost would probably be a lot lower at an independent muffler shop for a cat replacement - FWIW

The Miata, 99+ years, has a reputation for a cat failure, especially after a coil pack failure the 99-00 years. The cat seems to be very weak on the cars....especially the California models with a pre-cat.

The aftermarket cats are 2 element instead of the manufacturers 3 element cats. From the Miata boards, people using aftermarket cats, which are not carb certified, have had their performance degrade within 1 or 2 years and the check engine light showing up.

While the labor to replace the cat would be cheaper at the muffler still need the Honda cat to keep from repeating the experience. The part is not cheap.

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