Its not the plugs that give it the extra 100 hp....... its the stickes..... everyone knows that stickers give you power
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i have em in my truck and i have noticed no difference.. if i change again ill go back with ac delcos.
I had some in my old truck, and it ran like total crap. Swapped for a set of stock style NGKs and it ran worlds better. Like many others have said, all they are are just a gimmick.