Because these wires are red and that makes it a racekar. I don't know way. I got a good deal on them. I have a set from Autozone I can warranty out and use if need be. But the thing is, I never get a light on for a miss fire code. So I would believe that are working fine. Car shakes a little at idle. But that might have to do with the solid rubber lower mounts and the polyurethane upper mounts. And it revs up smooth as can be. Haven't driven it yet with the new plugs in. I had to replace the alternator, tensoioners and belts. But I got to do some errands today and will se how it does.
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