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Not sure where to put this question, does the 4cyl and 6cyl have the same cat? Cause i found one on ebay for a 4cyl, but it says that it doesn't fit the 6.
I have a k8 with a stock cat that is clogged. Thanks.

it will not fit. If you put to small of cat on a exhaust it will restrict it and also make your engine run like .... well you know.