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Many people have done it this way...JohnZboy, 1sickZ, Mike84T, it's just very tough to weld to the stock exhaust manifolds.
 

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A little tough to do, but, can be done....

The cast needs to be pre-heated prior to welding. As close to molten as possible without damaging it.

Then use nickle rods or wire to make the weld. Keep piling it on until the bead is huge. This gives some extra support for the pipe, flange, and, wastegate.

Example:
 
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