Have not used these but I am currently using Bosch plus 4 platinum plugs which look a little like these I have been happy with them. There are others who don't like Bosch products and I really don't know if one is better or not IMHO as long as you keep with a name brand I think you are ok. I did use split-fires once in a Volvo 240 turbo and they ran like crap changed out to some Volvo plugs and it ran great. The split-fires look alittle like those too so again I am not much help. My experience says 1 for 2, Bosch ok and split-fire suck. Any way hope this helps and Good Luck,
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