[SD1too]

Originally Posted by T-Cut

There's a photo of the front pipes and catalyst assembly here: https://rimmerbros.com/Item--i-WCJ000391SLPP

EDIT: The second catalyst is part of this assembly (Item 8) https://rimmerbros.com/Item--i-GRID001949

Rimmer's has reproduced an ambiguous description from the MG Rover/X-Part Electronic Parts Catalogue.
RAVE shows item 8 as comprising three silencers; front, intermediate and rear. It has no catalytic converter.

The "starter" catalytic converter is the easily missed short bulge with a lattice surface visible in WCJ 000391SLP just downstream of the downpipes joint. The second converter is the torpedo shaped component and this will have the lambda sensor mounted at its output. Both converters are integral with the downpipes assembly.

Originally Posted by edwardmk

My V6 2.5 is booked in for Tuesday for catalytic convertor replacement. The garage was adamant the catalytic convertor had 'blown'.

That sounds like a highly dubious diagnosis to me. What does "blown" mean? If your "check engine" light is on the cause is most likely to be related to fuel, spark or combustion.

Originally Posted by Yadmit

I’m told the exhaust system is old and needs replacement ...

That's ridiculous Tim. Is your "check engine" light on? Is your exhaust holed anywhere and leaking gases?

Simon