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my muffler has a rattle that confuses me. let me explain what happend. i was runnin down the road about 60 miles/hr and my lead plug wire came loose of the coil and i guess some raw gas got into my exhaust and burned cause when i jumped out and looked under my truck and my muffler was glowing red. ?????? the only thing i could think of was that when this all happend it melted something in my exhaust. does this even make sense or am i being stupid.???
When I had the muffler on my 94 replaced they found it weighed about fifty+ pounds, the entire contents of the cat had been blown into it. The cat was a empty shell of its former self!
The muffler was clogged, I have no doubt it had been glowing red hot because of it but I never looked. Odd thing was before they pulled it they thought my cat was what was clogged via their inferred thermal gun, not the muffler.