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About MX-5 Bitz

MX5Bitz was created by MX5 enthusiasts for MX5 enthusiasts.

Our aim is to supply a full range of quality products and we are seeking suppliers.


If you manufacture or import top quality parts for the MX-5 Eunos or Miata please contact us using the link above.

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MX5Bitz - choosing a ceramic or steel monolith

What is the catalytic converter monolith ?
The monolith is the part of a catalytic converter that reduces the levels of pollution produced by an internal combustion engine. You cannot see the monolith as it is fitted inside the main body of the catalytic converter.

What is the difference between a ceramic and steel monolith ?
Steel monoliths are more durable than ceramic. A steel monolith will last longer than a ceramic one.
In addition as ceramic materials are more brittle than steel, the steel monolith is more likely to survive impact damage from grounding than ceramic. However impact damage can destroy either type and is excluded from both our and other suppliers warranties.

What is best choice for me ?
Diesel cats are fitted with a steel monolith as standard. For petrol engined vehicles the choice is largely a financial one. Either type will last far longer than the warranty period under normal conditions. A steel monolith may survive impact damage that would destroy a more brittle ceramic monolith. To make your choice you should compare the price of the part, fitting kit and fitting cost against the improved warranty period and consider how long you are likely to retain the vehicle. Where your original cat has required replacing prematurely because of a loose, rattling cat, I recommend replacement with the superior steel monolith.

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