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IMHO, I wouldn't waste money on spark plugs other than OEM recommended. Any test I have ever read on the various "improved" plug designs, whether double electrode, quadruple electrode, pulstar, super duper zapster plasma nitride kaboom, etc., are a huge waste of money. I say huge waste, because Pulstars are something like $25 a pop (X6 = $150!!!) and do squat for improvement. Frank Lee nailed it: modern ignition systems like yours don't need any help. If they did, GM would have done it from the factory. Spend your $150 on aeromods, a block heater (if it doesn't already have one) or a taller ratio diff from a scrap yard (or way taller skinny tires and a torch to saw springs to compensate...ha!). But that's just my $0.02.
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