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Catalytic convertor v6

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laney101:
After some info.

On my 3.2 mv6 i always had issues with light being on (precat issue) decided for a change at 130k

I swapped to 3.0 downpipes but were copy cats no oem (poor quality i know) car went better  but cats rattled and light still on  so in the emd i decided go back to stock GM 3.2 downpipes.

Refitted but move second lambda boss post main cat. Whalaaa 10k later and still not had light on dash and no rattles from cats.

Now heres the issue.. since fitting them again (original Gm 3.2 pipes) definetely feels a lil down on power not as responsive and when it has a session of hard driving ( only has to be a mile or two) right under car where cats are you can feel heat standing by car it gets really hot. And has a slight smell.

Had this on other cars when cats are blocked or failing and wondering if it is a sign of the cats being past their best or just is what it is.

If they are due replacing whays best option. Do i buy approved new pattern cats.

Do i cut out gm cats and install sports cats in down pipe
buy 3.0 downpipes and have a o2 adaptor to move sensor aeay or something else ??

Any suggesstions or ideas be welcome

Cheers in advance

BazaJT:
I don't know how effective[or not] or how expensive such products are but could you try putting something like Cataclean through the system to see if this improves matters before going the replacement route?

laney101:
I use cataclean twice a year anyways bud ... doesnt seem to have improved it

Doctor Gollum:
What fuel do you normally use?

biggriffin:
Finding a set of decent 3.0/2.5L cats will be difficult, if your going for sports cats, then use the 3.0L downpipes you've alread modified,  Or buy a at of new pattern 3.0L and modify to fit 3.2... but try using a quality fuel for a week, and give it Italian tune up First.

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