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I've tried guite a few and the best ones seem to be from Nissan ! It's a NGK plug that ends in a 6 ( standard 350z plug ends in a 5)! The 6 is 1 degee colder and Nissan sells it for about $14 each. I've also bought the same plug over the internet for about $8 each! I have the info.(plug #'s) @ home and will send it to you tonight. (Both Nissan's # & NGK's #)