1990 90 quattro 20v 2.3 exhaust

just purchased the beast and heard a wee blow from exhaust; on looking it appears that the front half is a different diamater pipe from rear!; also,
when replacing worn o ring had to buy one from the 80 exhaust sytem! so..has someoneone put an 80 front(or rear) half exhaust on; can i ignorer the lamda sensors and cut out the cat?..any help[ appreciated....
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jakeydee wrote:

in order to manage fuel efficently so leave the CAT in.
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