Hope this hasn't been discussed, but in the most recent issue of Turbo magazine, there is an article about adding hyper Ground System cables from Sun Automobile.
One example was a '95 RX7 with stock engine, Apex fmic, RSR cat back, Apex power fc tuned by XS, 550cc primary, 1300cc secondary, stock twin turbos.
By adding this grounding system the dyno indicated an increase of 15.3 HP @ 6500RPM. 313HP to 328.3HP.
2002 Honda S2000 +2.1 HP, 2002 Suzuki Aero +3.9 HP.
Replaces any car's grounding system and makes HP through reduced electrical resistance. Cables are made out of almost pure copper. Each Hyper Ground wire uses 1477 strands of 99 percent pure copper wire. Everything in the kit, battery adaptor terminals,wire lugs etc, are made out of almost pure copper.
Kit about $100.00.
Sounds interesting.

 

This has already been discussed.. do a search on it.

IMO, this kit is worthless and you could make one yourself at Home Depot or Radio Shack for about 10 bucks.

Brian

 

Make your own from welding cable. Very fine strand wire is best . Solder your ends, not just crimp them. My mechanic makes his own ends to fit, he will not use the thin cheap copper ends.