Tools Needed: 12 socket and ratchet, some WD40, exhaust assembly paste
Nat, from the backbox u will see 2 bolts with springs around them, you need to undo these first.
when u have take them out you will be able to free the pipe. If you spray some WD40 on the 2 rubber exhaust mounts if will make them easier to remove and refit. Slide the rubers off the backbox by pushing them towards the rear bumper while pulling the backbox towards the front of the car.
Before fitting the magnex, spray a bit more WD40 on the rubbers to aid fitting. Slide the Magnex mountings back into the rubbers. Its a good idea to spear the end of the 'B' pipe with some exhaust assemble paste to help it seal. (can get this from Halfords) Locate the backbox pipe into its hole.
Refit the 2 bolts with the springs and tighten. Adjust the rubbers to make sure the box is alinged with the bumper.
Polish the backbox and take some pics, and host them on the forum