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I have them on my car and I like 'em. Considering the size of my motor, I can feel a difference. Headlights are brighter too. Just find the ground wires alread on the car and replace them. There is one on the battery, one on the block or head (don't remember which) on the driver's side and another on the passenger side. That's all I found, but the Spoon kit only has three wires for the Civic so I assumed that was all of 'em.
Originally posted by civicsleeper but are they worth the money???
If they are implemented correctly, then maybe yes. I just went to the audio store and bought 10ft of 4 gauge wire, and some connectors for ~$30. I also soldered the connectors to the wires for a better connection...