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Most dealers will tell you headers will void your warranty. Depends on your dealer though. You can drive your car without a tune but its bad for a few reasons. You will eventually get a CEL (sometimes they pop up immediately), you will be running rich (wastes gas and eats plugs), and you'll be leaving power on the table. But, if you want you won't blow anything up if that's what you're asking. I'd keep a obd2 scanner handy to delete the codes as they pop up.
To answer your other question yes, thats with all headers. Even shorty headers will throw a code sooner or later, especially if you add high flow cats which we recomend (you'd gain more power from high flow cats then shorty headers).
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