Rear silencer replacement

[Ray]

Could anyone offer any help on how to replace my back box. It is a 1991 SE turbo non cat model.
It has a large hole in it where the pipe meets the box and is unrepairable. I was going to buy one from SJSports for £187. Does anyone have any hints on how to remove it. It is quite rusty where it joins the main pipe. There are two rubber mountings one behind the bumper and one where the pipe has a bend in it. I'm not sure which one should be disconnected first.
Any hints or tips whilest i'm waiting for the box to be delivered would be much appreciated.
Ray.

[Dico]

Plenty of WD4o on the rubbers to lubricate, both for removal and refit.
Remove the U bolt (may need a new one if the original nuts snap the U bolt)
Give it a good whack with a hammer at the joints to help loosen them.
Wear gloves to protect your knuckles.

It aint a great deal more - say a tad over £300 for a fully fitted system with a lifetime guarantee. i.e. Peco's system in the thread below.