The bumper itself is not connected to the airbag system. The airbag system has crash sensors that determine impact based on inertia and deploy the bags when impact is high enough. A bumper comes into play when its crush rate is under or over the crush rate of the stock bumper. The airbags system in each vehicle is designed around how it "crushes" on impact. A bumper that is too strong and does not "crush" may cause the airbags to deploy at lower speeds because the energy is transferred to the frame instead of being absorbed by the bumper. As a softer bumper would have the opposite affect...I think I got that right from my airbag training class.

That said, I know ARB has a facility where they test the crush rates. Most of their new bumpers meet the crush rate of the factory bumpers but I can't say for sure on the 3rd gens. I can't seem to find it on their site either. I would give them a call. Regardless of what bumper you choose the airbags will always deploy. Might just be milliseconds slower or faster than desired.