I've tried to do a search on this topic but have come up empty.

Therefore:
What are they, where can I get one, what enhancement will it give the car, and what do they cost?

 

I can't believe you didn't find anything on the search, but its high gauge wire that attaches to several spots on the engine to provide a better ground. You can get the Japanese Nissan option that runs about 200 from japanparts.com, or you can buy one from Skidazzle or insaneamine online here for much less. Most of us bought our own.

Benefits: Smoother idle and operation throughout the rpm range, possible longer life for components.

 

its the red wires in this pic

 

Yes, I tried a search a couple of weeks ago and indeed it came up with nothing on the site here.

Thanks for the info, I'll look into this further.

 

https://my350z.com/forum/showthread.php?threadid=11450

 

Thank you!

That's the thread I saw last month but couldn't find again.

I'll go through it fully and contact you directly to place the order.