Paul:   A solution to the cracking problem would be to put only short stubs
on the exhaust manifold flanges and use "antivibration unions" from there on
out. For the life of me ,I cannot remember their name but they use a
"v-clamp" to join two welded on flanges. They are sold by BURNS STAINLESS in
calif. Of course you have to support the muffler as you rightly stated
somewhere on the engine to kind of keep it vibrating at the same frequency as
the engine. The last thing is to weld the stainless with the right rod and at
the right temp and with the right purge.   JIM DANA

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