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I prefer the +2's over the +4's. They are a very good plug if you objective is to put them in and completely forget about the plugs for another 100+ thousand miles.
Or you can go cheap with NGK coppers for 15-30K intervals for $1 plug. Or for forced induction get irridiums from NGK spec'd for the STi just a heat range or two colder than stock. (STi plugs are pre-gapped correctly for forced induction)
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