If it's done 50k it's been round the block a few times D. Looks like the rattle can silver could be hiding quite a bit, not sure I'd be putting my £165 into it.
The 3rd exhaust thats on my car is a pattern part, code is something like REN927. Cost £220 for the whole system. It was the only system I found to have identical tips to the standard system, it also lasted twice as long as the original.