Don't understand something. Bosch plugs are no good and don't fire properly etc in a
Toyota but are good enough for $160,000 Porsche Turbo. Bottom line is that different brands have bigger or narrower heat ranges. You may have to change heat range of plug depending on timing, comp ratio, fuel and on and on it goes. Not trying to be an <img src="/forums/images/graemlins/butwiggle.gif" alt="" /> about this but plug brand is not a factor in this situation but rather heat range is the factor if anything.

Last edited by kewlynx; 06/26/07 06:40 AM.
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