Anyone Upgrade NAD D 3020 Power Cable?

I would also suggest a Pangea. But would say you would get better results with the bigger powercord.
So I suggest a Pangea AC9 or AC9SE.
Be warned that the short (1/2 meter or even 1 meter) AC9 and AC9SE do not twist! The are torsionally VERY stiff.  So the cord cannot rotate to fit some IEC plugs and the duplex wall outlet.
So I would say if you buy one, that 1.5 meter is the shortest to be happy with this.

Also Audio Advisor is the only seller of new Pangea. And they have a full return policy. If you buy the cord, you can return it if it does nothing for you.
I own about 15 Pangea powercords and am happy with them and my $5,000 a pop electronics.

Yes, the AC-9s are recommended for amplifiers. However a 2M length of AC-9 would weigh about as as much as the 3020D. I think the weight and stiffness would be difficult to manage in this case. 

I should have added that the AC-14 I mentioned is being sold by Audio Advisor.

@mesch you are right the D3020 is very light so a heavy cord won't work

@mesch @elizabeth the PC connector is a ICE  C5 so I would need an adapter adding another $25 to the cost. I think I will pass on the PC upgrade, especially not knowing if there would be any benefit.

Thanks to all who responded! 

Sorry I forgot the power connector was C5. I had the 3020D in my possession for about a month when it first came out. Should have remembered. I believe Pangea only terminates with C7 and C13 types. NAD does ship there budget amps with some pretty low grade cords, 18ga I have seen.