Biggest benefit of multi-electrode plugs if the car doesnt require it is that pretty little lightning bolt they print on the package...
I've seen a lot of people (particularly ricers) spring for the multi-elec. plugs to compensate for their own stupidity, particularly when they throw a plug in without gapping them, causing a miss. One of the best excuses I ever heard was from a "friend" back in high school, who put in a set of the multi-elec plugs and told me "that his cold air intake made him too much power to use regular plugs, and that his motor wouldnt run unless he used the multi-trode Boschs." He had his old plugs in the car, and I took a peek at them; gaps were so small and inconsistent I can't imagine a car being able to run with them.
Don't waste the money, nothing hurts like dropping 40 bucks for plugs (have to for my rx7).
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