Your car has 3 cats.
1 in each head pipe... and the 2 into 1 cat.
Sounds like a primary cat in a head pipe is clogged.
Jim
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1992 Dark Teal LS-L with 4.44 swap. NC Plate "EVIL I" *Dont Fear the GEAR*
1977 Ford Pinto baby blue with 79,000 miles
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