its tight back there, best thing maybe to un bolt the egr and take it off with the rear manifold. then get the bolt off with vice grips.
id take the erg off, its got two bolts there. to get the extra weight off tube, then un bolt its stand, its two bolts on the side of the bracket, then un bolt the other tube from the manifold pull the tube from the lim, then lift the rear manifold up and out, if you cant get it out ( you should) but high enough to un bolt it likely.
you'll need the down pipe un bolted to lift it up and out. or drop it out the bottom too. dp has to be off for either.
