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I did this
I had an S muffler modded this way. Living in a small city in Louisiana, none of the welding shops had the stainless steel tubing, so I did an internet search and bought the tubing and pre-bent angles (stainlees steel requires mandrel bending, which your shop may not be prepared to do) and then had a local shop do the welding and install. If I had to do it again, I would go with a larger diameter pipe - the 1" really is not loud at all. And no resonance. Do some searches on the various Boxster forums and you will find plenty of info and pictures.
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