Sorry Kriso not been on here in a while... Basically you need to remove the heat sheild, yeh the flat metal at the back. No need to remove the 90 degree pipe or the heat sheild wrap at all.
No need to undo anything in that picture.
This is held on by 1 nut on either side.
So I remove the top of the tip but find the tip is still in the way so I completley remove this, undo the nuts at the back of the heat sheild and then you can get to the bolts. I purchased grade 4.4 I think stainless steel bolts, new gasket, and spider (shake proof) washers.
(Touch wood) This has lasted so far.