The airbags don't necessary deploy as normal with an aftermarket bumper. They will deploy regardless which bumper you have or even if you don't have one at all due to those g-force sensors. Their timing is dependent on how the stock bumper absorbs energy and collapses. What ARB I think claims is that for any given crash the time from impact to when the airbag inflates won't be changed. With an aftermarket bumper that is completely rigid it's anyone's guess. They might fire at a lower speed or sooner in the impact sequence. That's the main problem in my view, that the airbags might have inflated and have already started deflating before they would have done any good in a major crash.It’s only approved because it’s been tested. Air bags don’t deploy based on crushing a sensor. It’s the g force reading/ sudden stop that makes them deploy so with any aftermarket bumpers. They will still deploy like normal. The biggest difference is the bumper won’t absorb the hit as well and more forces is passed into the passengers. I’m ok with this so I rather have a fixed hard mounted bumper than one that crumpled.