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With the extra air flow from the headers it will cause your A/F to go a little leaner but your ECM will compensate. It was argued before whether the ECM could compensate enough but most say it can.
A lot of the sound and power typically associated with LT's actually comes from the downpipes (whether they be high flow cats or catless) You could look into just some high flow cats since some of them are not supposed to throw codes.
Moral of the story, LT's will throw a code without a tune but will most likely not damage your engine extremely. A good tune will only help though. A lot of power and sound can be freed up by just replacing the stock cats and this won't necessarily throw a code.
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