Would you be so kind as to tell us what year your 200SX is. You never know, you just might get a reply.
As far as the air bag...if you are really really really concerned about your airbag going off, you could just disconnect the negative terminal on the battery. You must wait about 10-15 minutes after you do this to let the relays unenergize (I don't know if that is the correct word...but it works).
