what dose the battery volt stabilizer and ground stabiliver really do there is one on ebay and it says it improves the prefomance but dose anyone else hav one http://cgi.ebay.com/ebaymotors/Nismo-Ground-Wire-Voltage-Stabilizer-Murano-Xterra-Van_W0QQcmdZViewItemQQcategoryZ33577QQihZ013QQitem Z230087380920QQrdZ1

I've never heard of a "volt stabilizer"

But the grounding kit usually upgrades the current grounds to larger gauge wire and adds more grounding points (usually between battery, engine, chassis, and alternator)

It's been pretty a popular mod in the import tuning scene and seems to work well.

but what is it really for???

Well the ground kit reduces the resistance on the grounding system, so it helps the starting/charging and ignition systems work more efficiently.

I still don't know what that other doohickey is, I guess I'll look it up when I'm bored :D

ive seen it on ebay a couple of times and i was just wondering what it was....