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you smell em and had a code, ones probably done. had one completely collapse on my 5.3 tahoe and i was chasing a misfire forever and the bad cat was my issue. i removed the y pipe and gutted all 3 and reinstalled. my giant main muffler and the little one in the rear are still intact and no adverse odors or issues.
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86 Camaro
88 Camaro
95 Impala SS
97 Trans Am WS6
98 Blazer ZR2
00 Corvette
04 CTS-V
07 Sublime Charger Daytona
10 Tahoe SSV
12 Tahoe LT
17 Malibu LT
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