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Sorry for the dealyed repsonse. I hadn't been on the forums in a bit. I suppose you have already gotten your plugs by now, but in case you haven't, I have been happy with HGK plugs.....both the copper and the iridiums. I haven't seem a bit of difference between them. Get which ever is cheaper, I suppose. either get the lfr6a-11 or the lfr6aix-11. Leave the gap the way it is......it comes preset at 1.1mm on both of those plugs it workd well with forced induction.
Enjoy your car and feel free to contact me with any questions!