Hi AMGlover,

Car seems to be running fine - mixture is neither rich or lean as far as I know - but I can ask the dealer to check it out to see if this a factor.

Tyre and Exhaust centre guys know me and that the Crossfire was under warranty - so there was no chance of me buying a new exhaust /cat from them.
They simply reckoned the cats were melted and to take it to a dealer for replacement. Dealer confirmed what had been said earlier.

I do accept your point that the front cats might be damaged too...

Regards,
Lowlander