A new muffler was bought for the 1967 MGB GT on April 20, 1978. This is approximately 2 years and 12,000 miles after the last muffler replacement. Sounds a lot like my 1987 Mazda RX7 that used to go through mufflers like crazy.
Midas Muffler Shop came to the rescue this time for $31.22. I wonder how long this one lasted?