Egr valve blank.

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Does an EGR blank show much? is it worth the bother of doing?

Not really unless your valve is leaking (which a few seem to be now)

Doesnt add power to to speak but stops dirty exhaust gases being recirculated into your inlet. If youve ever stripped apart a diesel Inlet manifold u'll know why lol!

Yeah If you have a look in your inlet you'll see a thick black gunk up to about 10mm thick coating the inside of the manifold, this is the product of exhaust gasses mixing with the breather oil and is a massive restriction.