Exhausts frequently break after welding, so many
people think it's not a good thing to do.
Not true. The problem with welding exhausts is
that few people have the correct jig to position
it while you weld it.
So, usually what happens is that the exhaust pipe
warps, and when you put it back on, it doesn't
fit very well (if at all), and it's under stress, and
it quickly breaks again.
The thing to do, is after the exhaust is back on,
if it is under stress, to heat it up with an oxy-acetalyne
torch until it is cherry red in a band. Tighten up
the exhaust bolts or nuts.
Now that you have stress-relieved the exhaust,
it will last for a long time.
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