NGK! they are the stock plugs and they are the best. i have seen a million gabajillion nissans run bad on the wrong plugs. some people say they have good luck with denso, but dont ever use bosch platinum or el cheapos. even the high end european cars dont use bosch platinums. they use regular bosch super plugs. i personally use ngk regular(non plat) one heat range colder in my sr.