Ok so I have a 2004 A4 Ultrasport that tends to have a rattle that I can't seem to track down. It doesn't rattle all the time, but when it does, I can generally take my foot and push on the middle of the front bumper and usually make it stop. Is there a bracket or something in the middle of the bumper underneath that I am missing possibly? Anyone else ever tightened up their bumper and how to do it? Thank you for your help.