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I probably wouldn't bother indexing plugs with that engine (in fact, I had that engine and didn't bother in my '03 Matrix). The Honda lean burn engines like to index their plugs, but they're running them lean and relaible ignition is critical to them. The lean burn engines are also designed to take advantage of the indexed plugs. With a normal engine running stoichiometric air fuel ratios you aren't going to see the benefit that you would if you were running lean. You might get a fraction of an mpg boost, but I highly doubt it would be noticable.
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