My Stainless exhaust has a life time guarantee. The silencer box appear to have developed a split, is rattling and not sounding so good. It must be 15 years old now but the garage that fitted the exhaust closed down a years ago, so going back for the guarantee might be a problem.
A new generic stainless silencer is £187 and would need modification to fit. I feel that a stainless box is more prone to fatigue damage than a standard mild steel boxes. Plus a standard series diesel silencer is £49.
Instead of going back to full stainless, I plan to join the SS down pipe and tail pipe to the mild steel silencer. It looks the best long term answer.