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when i went to discount auto like 3 weeks ago i bought 1 range hotter, it was #6. i went back to get the 1 colder, WHICH THEY DONT STOCK
he said was #4 cuz NGK was diff from all the other plugs
6 is stock for a gsr 7 is colder,the auto parts store you went to don't know shit..bkr7e-11 is the colder plug, good for forced induction or high compression....Ngk is not backwards!!