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[Abiton]

I'm on unfamiliar territory here as I don't have a V6, and I've never had emissions problems, but...

...if overall mixture is lean, and you still have high CO, it must be one/both cats not doing what they should?

Can you not separately probe each bank/cat, by putting a CO probe up one or other exhaust pipe, at some point where they are separate (if that isn't the case all the way through)?  That might tell you whether one bank/cat is worse than t'other.

Might involve disconnecting bits of exhaust to get to a point where you're just looking at one cat at a time, but probably worth it; you don't wanna replace both cats if only one is failing in its duties.  :-/

[24_Valve]

thanks Abiton will definately have a think on it. Can't recall exactly where they join into 1. Guess its just behind the back box, so would need stripping down because it has 2 exhausts/cats ending in one back box/tail pipe. Wish it just had seperate twin exhaust tail pipes, like other motors 

[markfree]

thanks Abiton will definately have a think on it. Can't recall exactly where they join into 1. Guess its just behind the back box, so would need stripping down because it has 2 exhausts/cats ending in one back box/tail pipe. Wish it just had seperate twin exhaust tail pipes, like other motors 

Yes the 2 seperate exhausts join at the back box - you'll need to undo the large jubilee clips which hold the 2 exhausts onto the back box, then seperate the 2 pipes from the back box - easier said than done, cause if you're exhaust  is past it's sell by date you might need an angle grinder or oxy-acet torch to seperate them, then you have the problem of joining them back again :-/