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I had them in my GMC. 5.3l, magnacharger/headers/ no problems with them. I dont think its worth the money, just my opinion. The NGKs seem to be the best. Cheaper too.
I've used them, didn't get any performance gain. They burned nice and clean when I removed them to inspect them though. They sure are frickin expensive.
Yeah forget about it then I will stick with gettin NGK's......... Dont want to spend the money on them if I am not gonna see any performance gains out of it.