I have searched and read about NGK's, Denso's and TQ Master's and I still ahven't been able to get a definitive answer by reading the prior posts as to which ones to get. I've read that the NGK's have had problems with a very few people, while the Denso's have reported no such issues but cost a great deal more than the NGK's while the TQ Master's first generation had issues while the verdict is still out on the 2nd generation plugs. I will go with iridium plugs. What has me wondering is that I saw that a few of the reponsses came from people who were either on the bottle or boosted while I plan on staying NA for quite some time. Thanks for the feedback people.