You're tossing out an airbag for looks? Never mind the legality, there's something you've overlooked. Your insurance company might not be too keen on this mod. Suppose for example you're involved in an accident, and the airbag isn't there. If you're injured because the airbag is missing, will your insurance company deny your claim? Or can they cancel your policy because you deliberately removed a safety feature, purely for cosmetic reasons?
Live fast. Die young. Leave a good looking corpse.