[ParisTNDude]

IMO, there are plenty of CAIs that will not cause a check engine code. My Kooks LT headers and HF cats didn't cause a code as well. Considering the high cost of a dyno tune, I would wait until you decide to put LT headers on the car (trust me, you will), then get a tune. There's a thread posted where one of the C5 members put a law suit on GM for failing to honor the warranty when the faulty item could not have been impacted by performance parts and the C5 GM settled out of court and paid (plus court costs). You should find that and read it, it's very enlightening!