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Better fuel economy, more spark. Stock work just fine... but the theory behind better wires is this:
MOre spark gets to the plug, therefor burning more fuel and air. Burn more fuel and air, get more HP and Torque.
If you buy new wires though, they should be checked with a mutimeter to make sure that they all have a similar resistance. Higher resistance wires wont spark as well. I've bought wire sets, and find that out of the box, usually one would have a much lower resistance then the others like it was defective.
When you put more spark into the cylinder, you can burn more fuel or air, but you have to tune everything to work right together. If you are running lean, gotta add more fuel... conversely if the opposite is true.
--Scott
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