For a track only car, a custom chip will do the trick for the emissions. For a street car, leave the emissions equipment intact. The HP gain isn't worth the trouble & expense of a custom chip unless you are having idle or other problems.
i deleted my airbag by taking out the blue box behind the heater control. there are two plugs. ive had it out for 4 months and have had no codes. also might wanna wrap the connectors with electric tape if your gonna leave them there, mine was still hot when i unplugged it.
I plan on a custom tune and chip when I get the car back and running. I think that is the way to go because I really don't like the idea of a bunch of simulators.
That air bag module, I think I know where that is, simple enough.