I had a few questions about grounding wires.
Do they just replace original wires?
Are they hard to install? (I don't think they would be, but tell me if i'm wrong)
Do you feel a difference in the way your car drives and/or runs?
Are they worth it?
Any information would be great.

1 - pretty much
2 - probably not
3 - f**k no
4 - only if the wires were free and someone installed them for you

there's only two scenarios I can see grounding wires doing anything useful (and even then, why spend how much on a ground wire kit? 4 gauge wire does the same d**m thing for 1/10 the price):
1) vehicles with large electrical demands that could actually use better grounds
2) cars with engine swaps

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-1994 civic ex - sold 7/28/08
-2001 cbr600 F4i - sold 9/25/08
-2001 Mustang - the DD for now
-1996 civic dx - maybe lol

dito. unless you have some added stereo stuff thats a decent size. your stock ground wires are fine. those large spider web ground wire things are just ugly as hell! and not needed.....

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I still have the stock sound system, but i'm thinking about getting new speakers and maybe a subwoofer.

I honestly doubt that will push your electrical system to the limit where a ground wire kit would help much... if you haven't already bought one, I'd say save your money.

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-1994 civic ex - sold 7/28/08
-2001 cbr600 F4i - sold 9/25/08
-2001 Mustang - the DD for now
-1996 civic dx - maybe lol

I was debating whether to get one or not, but it doesn't sound like I need one so i will save the money. Thanks guys.

save your cash and just buy some 4gauge amplifier wiring and some crimp conectors and make your own replacement ground wires...

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they're called braided wiring, and they're not useless, they use them in tractors and heavy duty equipment. i like mine, it looks good, and i had to replace it due to the oem bolt being striped out anyway.

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you won't feel a difference in power, but my car started up ALOT easier, especially in winter, with new, larger ground wires. Headlights didn't dim during bass hitting either.

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I was thinking about that... if he's putting in an amp/sub, he'll have some amp wiring left over most likely... just use what you have left over for DIY ground wires, and there you go... free ground wires.

__________________
-1994 civic ex - sold 7/28/08
-2001 cbr600 F4i - sold 9/25/08
-2001 Mustang - the DD for now
-1996 civic dx - maybe lol