Posted 15 April 2008 - 01:09 PM
I disagree. Your car is legally required to meet its homologated emissions for NOx, particulates (smoke), CO and hydrocarbons: usually Stage III for a Mk3 Mondeo. Without the cat, you're unlikely to remain within the CO and HC requirements. If the earlier post about them not being tested is correct, you may get away with it.
This is nothing to do with VED ("road tax"), which is based on CO2 emissions. The cat, as you infer, does nothing to affect CO2 emissions (except slightly degrade it due to increased fuel consumption).
When you take a de-catted diesel car in for its MoT test, you'll almost certainly fail for excessive CO+HC. rainbowcar - I'm open to corrections if you can tell me you've taken a de-catted diesel through a non-hooky MoT test.
bip78 - why would you want to do this, anyway? The cat sorts out 90% of the carbon monoxide and hydrocarbons coming out of your tailpipe. Do you think it's appropriate to subject everyone else to increased emissions just to gain a negligible amount of power?