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Seems like you've got it covered now but I would look at Subaru model specific forum to see what others with your model and vintage would suggest. Generally, you'll want to buy plugs that are pre-gapped for the specs for your motor. I would also consider copper plugs if you want more power but will change them more frequently (much easier with an I-4 compared to a boxer). So in the case of a Subbie, I would probably go with the plugs that have the longest life since changing them is a pain. Don't forget the anti-seize.
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