If you have a basic engine knowledge, I would recommend using the procedure that I did that is located here - Eliminating The EGR Valve - LN130.
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The EGR pipe is shown here as part number 25624:
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Step 1: Remove all 4 nuts holding EGR pipe in place. Remove EGR pipe.
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Step 2: Trace around EGR pipe end on a piece of suitable steel plate (mine is 1.6mm). Cut out using tin snips, be careful with off cuts as they're sharp as!
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Step 3: Mark bolt holes on top and bottom of blank, then drill. I used a 3/8" drill bit for a little extra play.
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Step 4: Clean up all edges with a suitable file for a neat finish.
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Step 5: Using suitable hi temperature sealant run a bead around both sides of new blanking plate then install.
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Step 6: Re-install EGR pipe, nuts and tighten.
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I've noticed a difference as I used to get really high temps on the highway (100C+) and I can't get it to go past about 88C - 90C now. I reckon that's why I did my head the first time, with any luck it won't happen again.