Does an aftermarket power cord matters for Amp?

Although I have never had the privilege of trying Subaruguru's Prelude No. 13 in Cu, when I ran the top of the line Mapleshade power cord from amp directly into the AC wall outlet, there was an obvious increase in dynamics, transient speed, and bass extension (plus, other improvements) for my Aronov Audio LS 960i tube integrated amplifier.
The VAC Avator has a comparable performance, so I am sure you will be pleasantly surprised how much a better power cord contributes to enhancing an already great component.
As pointed out by Stuartbranson, there can be very impressive power cord performance for a moderate price.

Cords that have made a significant improvement are from Kubala-Sosna Research - and yes - on the amps even more than the CDP. www.kubala-sosna.com. Good Listening!

Absolutely! Now finding the right cord for your system is the fun of the hobby. You'll get enough recommendations to keep you busy for a long while. The homework will be fun. I just replaced my Lat Internationals, serveral weeks ago, with two Sonoran power cords run from 2 dedicated outlets to my Eclipse power conditioner. (am I nuts with my electric, or what?) Today, my Harmonix Studio Masters are arriving. They will go from Eclipse to cdp and amp. You, certainly, don't have to get crazy with pcs to get audible benefits. But be careful, out there. It's a jungle and power cords can become a $$ habit. peace, warren

P.S. I have used Ern's cord. You can always email me for more feedback. It's a nice introduction to power cord possiblilites, BUT fasten you seatbelt....

If you are happy with the Synergistic AC Master Coupler you are using on your front end, you might want to just step up a notch. I use the Active AC Master Coupler (w/mpc) on my B&K receiver with very good results. This last weekend I tried a Dimarzio PC (I use Dimarzio Super M-Path speaker cables) and although the sound was pleasant, the SR provided a much wider bandwidth of info and better bass. Also, many P/C's still exhibit an audible hiss when the sound is muted. The Active SR virtually eliminates the hiss. all of the above suggestions are good, however you could just stay with something you know. My 2 cents.

My first pc upgrade was two relatively inexpensive Sonic Horizon cable into my amp and preamp. The difference from the stock cords was quite noticeable -- more refined sound. I have since "upgraded" tp more expensive Michael Wolff cords. They make subtle improvements, but not as significant as the replacement of stock cords. The replacement of stock cords created a larger difference than when I subsequently added a Richard Gray Power Company 600.