Do I need upgraded power cables?

Two hours into a Saturn power conditioner with an M101 power cord.

So far so good. 

"Do I need upgraded power cables?"
Only if your current cord is broken or the wrong size...or if you want a nicer looking cable.
For sound improvements?...NOPE

Ignore trolls.

"Ignore trolls." By trolls do you mean ignorant people living in a delusional reality of imagination with ZERO proof to back up their claims or people with actual knowledge and FACTS to prove their claims?

I have been listening to audiophile grade equipment for 25 years. The first items I bought came with an upgraded, aftermarket power cord (for amplifiers).  Since then I have used mostly standard power cords with my other equipment.  Over the years I did try one or two slightly upgraded power cords ($50-300) in my pre-amplifier and other components, but didn’t hear any difference.  Last year, I bought standard power cords for my amplifiers, and didn’t realize it initially, but it did slightly affect the sound quality in a negative way.  Just this past month I demo’d markedly expensive power cords ($1,500+) in my pre-amplifier, and heard a rather significant difference:  it affected the timbre of the instruments, and slightly enhanced the clarity.  This was a difference, but was it better?  Some parts were better, but overall it was just different, kind of like trying different interconnects.  Prior to this experience, I did not think a power cord could make much of a difference.  While I was experiencing this, I also learned a bit of electrical engineering, about how AC waves can have reflections at interfaces, due to different impedances of the conducting materials, which can create an interference pattern in the otherwise 60Hz wave.  Maybe that is part of what’s happening, maybe it’s something else.