KenP,
I don't know about the stock cats but XtremeFlow offers weld on high flow cats on their website. Last time I looked they were $269 for the pair. Obviously, they claim the requisite HP and MPG increase but I don't have any experience with them so... caveat emptor!
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Yellow 03 Adventure w/black Grill, UM8 Touch Screen Navigation Radio, U2K XM Digital Radio, Remote 6-CD Changer, JBA Titanium Headers, Corsa Off-Road Sport, Airaid Filter & MIT, Nology Wires & Plugs, S&P Pro-Flash, Warn 9.5ti w/X-Line, Toyo Open Country M/T 37x13.5.
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