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I've yet to see anyone show a perf difference with just stock -> any aftermarket exhaust on the car, including the removal of the cats (which isn't legal anywhere).
The exhaust is hot by the cats so you'd need to be VERY restrictive to make any difference. You can crush those pipes pretty good and it doesn't matter when they're that close to the engine and getting hotter within the cats.
I would still consider it a placebo effect both from the sound and from historic real benefits from cars of yesteryear. That being said, i've done exhaust mods to my car. I just wouldn't say it is beneficial to real performance until i see numbers - which i haven't tested myself and haven't seen any with the v6.
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