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I can honestly say the sound was dialed in.
I had an X pipe welded on, it was a nice and subtle at low rpms but at high rpms you got that nice deep European roar.
Damn, never thought of that.... where would these even be sold for that purpose ?
Here's a good reference with info on catalytic converter metals. Obviously you wouldn't sell it to these guys, but it's got good info on the subject at hand.