Changed my back box a few weeks ago as the standard vectra (B) v6 back box as it was blowing at the flange when removed I shook the box well it rattled like a salt shaker so it was fubard put a letter box stainless steel on for now was out yesterday and thought hmm sounds abit louder than before ? Not in a good way first thought was snapped flexi well nope it was the flange on the center section that had snapped off at its join so now have to fit another center luckly have a remus center section in the shed so going to fit that aint buying a new one when I have one lol now too get time to do it