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I've been thinking of purchasing an MSD ignition system, high perf. plug wires, and iridium plugs. I've seen on this site that people also have grounding kits and upgraded coils? What exactly do the grounding kits do? If I was to upgrade all of these things in my car would I notice any, even a little, performance difference?

 
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Well MSD doesn't make an ignition system for our cars, there are rumors of them in the process of making something for us but who knows if its true.

 
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we dont have plug wires on our cars, we have DIS ignition systems. Basically it is a coil over plug system. No plug wires , no distributor, nothing. ANd grounding kits wont do much. Maybe make your headlights brighter but that is it.

 
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Yup, so mods would be useless. I upgraded the factory ground wires with thicker 4 gauge wire and didn't notice a difference.

 
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Thanks!!!