I would assume your talking about the ground strap that grounds the battery to the chasis and engine. There are companies out there that are pushing grounding kits that will increase engine effeciency/power, but I find that hard to believe. [dunno]
I was going to replace the grounding strap in my '92 Prelude when I installed a competition stereo, and found that it was huge stock! No need to replace. I did replace it on my '88 Accord, so I guess it just veries from car to car.
2003 G35 Coupe (on order)
Diamond Graphite / Graphite
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