shelbydream1 Posted February 29, 2008 Report Share Posted February 29, 2008 For those of you who are a little more knowledgeable than I am about performance upgrades (feel free to chime in LuLu!)-Anybody have any experience with these? Would they be better than the catalytic converters that come stock on the Shelby GT and would they require a reflash of the computer? Or would they be a "plug and play" type of swap out? Would they be worth the $50 apiece/add anything HP wise? Link to comment Share on other sites More sharing options...
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