doubtful
I don't think Flowmaster mufflers came as a factory exhaust on Mustangs for any year. So whoever put the Flowmaster's on for you probably did weld them because they do last a long time. As far as replacement, they arent hard to replace. If cut right, adaptors are available for replacement of mufflers. An exhaust shop will do the job for u for about an hour's worth of labor.
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