blew out a muffler today

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stroker402

1968 dart GTS convertible
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i have dynomax ultra flos on my 65 barracuda 273 , today after jumping on her alittle must have I blown the fiberglass matting out inside the muffler or something, because it got a lot louder on one muffler. it's welded casing and nothing is loose rattling..... never had that happen before.... anyone else run into this situation?
 
Yep. Glasspack mufflers can blow out the glass packing.
I had a pair of glasspacks so blown out that if you hit them with a wrench, they would ring like a bell. About 95% of uncorked.
They got real old, real fast.
 
I knew a feller who had one of them there Knock off Jine-ease carburetors. Apparently it was dumping fuel and loaded up the cylinders so bad that when he finally got it to fire it blew his passenger side muffler to Kingdom come...I looked under the car and the muffler was wide open like the gash in the Titanic...I looked at him and said "what the hell happened here? did ya have a muffler explosion?"
 
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