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Welds are welds, as long as it's not going to crack it's sitting under the car...
But yeah looks like you forgot to re-use the donut gasket, was a common issue on the WRX catbacks as well. The Perrin catback does not re-use the donut gasket but it's made not to.
Also make sure that's the first joint you try to tighten and not the last.
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