Most disappointed to discover that my rear right tail pipe was sagging a little. On a drive into London on Sat, it drooped good and proper!!! It is now in my boot. Bugger.
Pretty common fault (search for previous threads). Rather than faffing about with re-welding etc. I'd look for a new back box (people are always getting rid of them when they put on sports pipes). Did this a year ago on mine and not so much as tinkle since.