Is the factory "sport bar" useless in a roll over? My guess is it works as a roll bar in a slow speed light roll over, and turns to spaghetti in a serious roll over. My '05 has the style that ties the main center bar to the windshield. Is that just to brace the angle of the windshield and mount the plastic seal going around the top of the door? Or does the windshield have enough strength built in it to tie it all together as a roll cage?