If it fails it'll be at the back of the backbox.
Can you see the condition of the bend at other end of the box?
They tend to last about 3 years, you'd be better replacing it with an after-market exhaust (stainless steel). Never have to replace it again
The exhaust I've just taken off mine looks similar to that.
They're rubbish! It had a new centre section under warranty at 16k.