When I was driving around earlier today I noticed an unfamiliar exhaust note being emitted from my wonderful 4000 quattro. I turns out that the CO tap line has blown itself out of the down pipe (right before the cat). Can this be welded back in to place? The fittings are still in the pipe but CO tube is just hanging there now. Thanks Ben 85 4000S quattro which I purchased for only $1500!!!!!!!!!!!!