I have airbags on my 05 screw 4x4 and I want to know... Why do you have to have a 5 psi min in the bags? I took the valve cores out and it rides way better empty without them. But with the min 5 psi it rides a little stiffer. I won't be doing driving on any extreme terrain where the bags might rip from over extension or anything so.. Anyone... Why 5 psi?