You can get a new flexi welded in mate, most garages will do it, make sure you get a good quality one though as the cheap ones don't last long, maybe mongoose will sell you a flexi?, i think that they have stopped making the exhaust for the Gti-R now though so i doubt you would get a brand new downpipe from them, or you could get a second hand downpipe as long as it's in good nick.