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Taking off the old one would be easy. I bought a screw in type bung at the local muffler shop, but I do not think they had the other style. Unless you are having problems with smog or if your cat is clogged, then you do not need to change the cat. There is not really any good way to test it, but it should get really hot if it is working.
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-Anthony
1987 4x4 Carbureted 22R truck
Grill & brush guard | Roll bars | Bed liner | Tubular rear bumper | JVC CD-player | Custom 6.5" rear speaker boxes with 6.5" Sony X-Plods | Polk 3.5" speakers in dash | Fog & driving lights
Future mods:
Dynomax muffler | Spray on bed liner | Custom switch for fog & driving lights
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