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Here's the stock M-body cat. It starts out at a full 2 1/4" and even gets almost all the way to the muffler EXCEPT for the last three inches, which neck down to pea shooter size 1 7/8" to fit the stock M-body muffler. Prices range as low as 80 bucks if you look hard. This slip fits perfectly into the Canadian Y-pipe and fits the floor pans.
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