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Yes, Copper plugs are awesome with turbo setup. Yes they don't last as long as the platinum/iridium plugs, but they are also only $2 a plug(changing them every 5000 miles or so, you'd be spending just as much money on iridium's with 4 changes).
and change fuel filter while you are at it with the Z32 TT filter(Wix or K&N brand) just because.
edit: the reasons behind sputtering under boost are Maf, spark plugs, bad gas, boost leak. It's usually the maf or boost leak, but I have a hunch that your problem is the plugs.
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