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More than likely its the downstream you can't fit. You can drive without it, but it will trigger a CEL. Do you have a bung for it, but it just can't reach? Do you have a cat installed?
you cant drive without it cuz the car will go into limp mode, what header is it?
you don't have enough information to make that determination, thats why i posed my question. I drove my turbo SXT witout the downstream attached for more than 1000 miles and never once went into limp mode.