Average Reviews:
(More customer reviews)I purchased two sets of these diamond fire technology plugs after seeing them used on horsepower television where they made a difference on an engine being dyno'd. There was an increase in horsepower and a reduction in emmissions, but this was a carburated engine, were the tech could make manual adjustments to fuel and timing.
I installed one set on my 2009 gmc Sierra pick-up which is fuel injected and computer controled and is self adjusting. I have to say that they've made no difference that I can see;I've been tracking my truck's fuel consumption on a L/100KM calculator since I bought it, I've gone though over 600 KMs so far with the new plugs and no improvement in fuel efficiency. My feeling? it's just another plug, based on old technology that goes back 100+ years. The only difference I've noticed is rougher idle quality. At least they're cheap to buy so I don't feel too bad having spent the $$ to satisfy my curiosity, and they haven't made performance worse.
I'll try the second set on my '06 Corvette, which I will do a custom tune on,I expect that I may see results similar to the ones on the tv show since I'll be able to adjust fuel and timing.
Sorry E3, I'm not impressed.
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