Thanks for the recommendation, I will have a look.
My problem is mainly with the manifold, cat and b pipe mate, not so much the backbox. The Toda is one of the quietest exhausts for the performance gain you get once remapped, however it does not have it's original b pipe, and the cobra that is on there is rubbish and probably hollow inside. The cat should be ok however it is so rusted away that I feel if I remove it off the B pipe I will not be able to put it back on as the hinges are in dire condition.
As for the manifold, I am sure it is going to be in the same state as the cat, seeing as the car is now 14 years old and what not.
I might give the M2 Silenced mid pipe section a go and see if I can put it on without destroying the cat side connection, if I can't and it does go, then Tegiwa 4-2-1 manifold it is...