http://cgi.ebay.com/ebaymotors/ACURA...Q5fAccessories

The only questions I have are is it worth it, does it work, and are the gains even slightly noticeable.

Not necessarily this kit but any kit.

 

I can't speak for the voltage stabilizer, though many members have attested to a grounding kit.

You won't get much power, so much as a smoother start up and whatnot. Maybe 1-2hp, but you shouldn't get it for HP gains.

 

It will help. How much? Well that depends on your car setup. Grounding is the return path for any unused power left over from the circuit. Electricity looks for the easiest path to ground in any circuit like a lightning strike. I cant say how well it would work(the advantages may not be much but it would help) or even if you need it unless you have more electronics or just for perks.

 

a homemade kit works fine--any extra grounds always help with better signal from the many sensors the car needs to operate
Main battery ground can get bad from crud eating inside,,,