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airraid was first thing i did on my car. i noticed a diff you could hear the motor more. but with open npp you might not be able to hear sound from the front when the sound from the rear is so much louder.you should see a nice lil gain from the tune esecially in the trans tune. i assume they are also tuning the trans correct?
generally, w. a quieter exhaust you would hear a more open type air intake. but as said above, w. the NPP open, I doubt it. on other cars I've had street borlas equiv. to touring and you can hear the aftermarket intakes.