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I use only bosch
 

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colder

NGK BP7, I run a "hot-setup" too, and found (for me anyway) that my 240 F54/ SU/ ZX ignition w/ Flamethrower P40 coil, and a colder plug seemed to work best. However, I can say with some certainty that, NGK's, in general, just seem to work better in Z's. good luck
 

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for as long as i have been changing plugs, i have used nothing but bosch platinums. forget all the snake oil and such about splitfires and +4's, nothing but hype and marketing for extra $$$$.
 

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i have some AC delco rapid fires in mine, i dont know what heat range it is, but the car is running rich now, dont know if it was the plugs that did it though. I didnt seem to notice any difference in performance with em
 
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