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OK, I'm beginning to form a theory here...
From the point of physics, you can light gasoline with either a match or a blowtorch. Either way, it's going to burn. Now if you're not getting a clean burn, then you're going to get uncombusted byproducts in the exhaust (ie. soot/smoke). So installing a new set of plugs will help out only if the plugs are bad in the first place. But so long as the new plugs are doing what they are supposed to do, all of them should work the same. Does this sound right?
Hmm, it was tempting to think I could get 3 hp from iridium plugs.
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