There is a mistaken assumption that a fancy spark plug will give a "better" spark and burn the mixture better and give more power, etc, etc, etc. This is not really the case.
Think about it. All a spark plug has to do is ignite the mixture, period. Once this has happened, it will have absolutely no impact on extent and the rate that the mixture burns. Unless you have a problem in the first place, like a dodgy mixture that is reluctant to ignite, a regular plug will set the mixture burning just as well as a fancy plug, thank you.
People may well report improvements such as "It seems smoother", etc. Well if you've just replaced some old worn-out plugs with some new ones, thats likely to be the case, but don't automatically attribute it to fancy plugs.
I will openly admit I am not an expert on this topic, but I have followed the car tuning world (and I don't mean Lax Power or any of that bollox!) and the writings of Dave Walker for some time. For those that don't know, Dave has tuned race engines for many years and has a bee in his bonnet about expensive plugs. I paraphrase him above. His company makes programmable ECUs for competition cars so I think he knows what he's on about.
Waste your money if you must!
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