Longer Power Cords Sound better?

Clearly, even in audio, size does matter.

Me, I would think about the room first before I start to think about power cord length. the room will more difference than any cable or IC now if the room is done OK or go spend money on music YMMV Marc

In a word; NO.
If your PC sounds better in a longer length, then you've got the 'wrong' pc. Of course, by wrong, I mean 'less than optimal', not 'horribly awful'.
I've listened to pc's in roughly .5awg increments between 9awg and 13awg, and in .5 ft increments between 3ft and 8ft (in gauges 10-12).
Yes, I'm that obsessive.
And when you find the 'right' gauge and length, that's when you discover just what your gear is capable of.

...13, 14???

Gunbei, Sonic_genius :nice maturity levels...when you grow up, get educated, and know how to respond like mature adults...yes Romy the Cat says it well....there are AUDIO MORONS on audiogon

I have herd that Shunyata was once commissioned a 30 ft length of Anaconda Alpha (original series) with amazing results. Unfortunately I have this info only 3rd hand with no additional detail, except for the resulting sound being reportedly superior to that of the standard 6ft length.