Technical Tips


BM Cats


BM Cats technical data

Click here to download the BM Cats technical pdf.


Think your cat is faulty?

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Type Approval

Click here for BM Cats' guide to type approval



Cat Facts and Fitting Advice  
  • Catalytic Converters have been a legality on all petrol cars since 1993.
  • The “European Emission Control Legislation“ enforces the limits for toxic emissions.
  • A cat is located close to the car's engine for heat purposes.
  • All internal ceramic monoliths have E9 Type 103-R approval under current European legislation.
  • The use of new fittings is recommended where available when fitting Cats.
  • An Emissions report is required for all emissions failures, as this gives an indication how the car is running.
  • Hydrocarbons are unburned fuel.
  • Ceramic Cats carry a 2-year warranty, Metallic Cats carry a 3-year warranty.
  • When fitting a Cat alone, put it into place & loosely fix it to the vehicle, if you tighten up one end you may not get the Cat to line up correctly.
  • A Cat isn't designed to get a vehicle through its MOT. A Cat's purpose is to reduce the amount of harmful gases being released into the atmosphere!
  • Don’t hit the catalytic converter with a mallet, hammer or chisel gun to try and force it into place.
  • Silicone can be used as a sealant in front of the Cat, but never use exhaust paste.
  • It is advisable to fit a Cat whilst the vehicle is on a ramp, rather than on axle stands.

List courtesy of BM Cats