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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 - advice on fitting a catalytic converter

Catalytic converters are not easy to fit

The following information should be used as advice when fitting a catalytic converter

  • Do not attempt to fit a catalyst unless you have experience in doing so. Catalysts are expensive items and any mistakes can damage them.

  • Always use new fittings such as gaskets, nuts, and bolts wherever possible. Use of clear silicone sealant manufactured for use on exhaust systems may allow reuse where a replacement gasket is difficult to source.

  • Never use exhaust paste in front of the catalyst. Doing so will invalidate the guarantee.

  • Do not hit the catalytic converter with a mallet or hammer to try to force it into place. Doing so may fracture the monolith and invalidate the guarantee.

  • Always offer the catalyst to the vehicle to check that it fits. If you believe the catalyst may have to be altered to fit please contact us immediately - you may have the wrong catalyst for your vehicle. Any alterations made without our authorisation will invalidate the guarantee.

  • Always fit the unit loosely before making final adjustments. It is then fine to tighten the unit at both ends. This will prevent fitting problems as tightening the front end fully before pushing the back end into place may result in a bad fit.

  • After fitting your new catalyst ensure that the vehicle is run at fast idle (approx. 2,000rpm) to allow the matting to expand and apply the correct pressure to the monolith. Failure to do this could result in the monolith detaching from the matting causing the catalyst to rattle.

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