Should I update my manufactures power cords?

Oops. For a second I thought I had accidentally joined the Grammar Forum. I stay away from there, between my own incompetence and autocorrect I would be in a world of hurt.

@farne230 

Definitely you should upgrade PC for your preamp, amplifiers, and the source.  I don't use AudioQuest brand so I can't recommend.  Good luck in your search of upgraded power cords.

Yes you should upgrade all equipment power cords from your conditioner to your equipment. Stating the obvious, choose power cords specifically designed for digital equipment or amplification respectively.  Brand choice is personal and there are many excellent choices in different price brackets, including the well respected Audioquest line matching the Thunder you have, Shunyata, Nordost, etc.  Each has their unique SQ profile.  Research professional reviews to guide you, then audition. The Cable Company has a loaner/audition program. Boutique brands offer equivalent or better performance and value.  I personally prefer WyWires Platinum Power Cords and they are currently 40% off and a bargain at that price.  I use a full loom of WW platinum.  Very coherent, detailed, clear and dynamic.  Alex (the designer and proprietor) is very helpful.  I recommend you audition a few brands.  Whatever your choice, moving from the OEM manufacturer’s cords to a better design will lower background noise , thereby improving detail retrieval, image density, soundstage, micro/macro dynamics, and timbre.  

Don’t know your system, but IF your preamp isn’t isolated with HRS grade isolation and you are running at least a Pegasus or better IC from your sources > preamp > amps, then i would ABSOLUTELY do that first. Try the amps to at least hospital grade Hubbel outlets direct to panel vs the AQ conditioning.

Then you can muck about w power cables…..

iF i got any of the Herbs mixed up with Downs, i pedantically apologist.