First and foremost, are you running a turbo? General consensus as far as I know is that Platinum/Iridium is ideal for NA applications, but you'll get the best performance out of conventional copper plugs (although not necessarily the same life) if you've got turbo.
same kinda thing, only better, around here at least, www.advanceautoparts.com
the one i goto, the woman behind the counter knows everything about cars, i swear.
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'87 Supra Turbo 5spd, no mods yet!
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