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Wow, such heated debate over such a small thing.
On old cars (say an AE86) it pays to improve the stock grounding wires (as they're usually very rusty and not doing a great job anymore). Remember that most (if not all) cars come with a grounding wire from factory and all you're doing is simply beefing it up. It really can't hurt so it's a worthy mod in my eyes.
Now about these newer fancy gizmos that go a little further than just a simple ground wire kit... I say they do work as I've seen a local magazine do a dyno test which achieved gains.
On a tiny little 1.3 car they got hardly any improvement (half a kw/1hp gain) but on a Nissan Skyline GT-R they saw quite a bit more. Interesting huh?
I feel that all those people saying that they felt a difference by putting one on are surely just fooling themselves... but in the end of the day it doesn't hurt to try one.
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