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[Nick W]

There is a hell of a lot of heat which comes of cats when the car is running. I would be concerned that binning the heat shields would allow all that heat to damage things under there ? 

Mine had none of the exhaust or cat heat shields on it due to age/damage/apathy about refitting them. Worked like that for several years with no problems.


There's a huge chunk of metal under the bonnet that isn't shielded which retains heat for hours

[Bigron]

We never had any such issues before cats had to be fitted - to solve a non-existent problem!
Now, we can't use leaded petrol in cars with cats and so valve stem clearances have to be increased, to the detriment of oil consumption. Once again, lead removal from petrol was unnecessary; but Johnson-Matthey did well out of it.....

Ron.

[biggriffin]

We never had any such issues before cats had to be fitted - to solve a non-existent problem!
Now, we can't use leaded petrol in cars with cats and so valve stem clearances have to be increased, to the detriment of oil consumption. Once again, lead removal from petrol was unnecessary; but Johnson-Matthey did well out of it.....

Ron.

And still are, just go to the plant in Royston, or the warehouse in Bedford.