I’ve been debating using iridium spark plugs. Are they worth the money and is there a gain in horsepower and fuel economy? What about aftermarket filters?
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We have used these plugs and found them to be good products. As far HP or economy increases, how much change is in my pocket?
Serioulsy, this would be very difficult data to gather and confirm – and at this time we haven’t made an effort to do so with any particular brand of plug.