thinking logically, if the tune that on the car is spot on AFR trims as to what the stock tune is, the you are seeing the exact same amount of fuel/air ration in the pipes. not saying that is anywhere near 100% correct...but from a logical standpoint.
although i realize that the cat-converters are there to lower your CO output into the environment, and if they have that big of an effect really...then find what numbers on the CO reading a cobra puts out bone stock and see if you can't get your tuner to load you a tune on there to match those as best as possible...just don't EVER get on the car in the least bit until after you leave and change back to your performance tune.
Thanks for the advise! :beer: