i think different engines will have different results with this plug,there has been some legitimate proof that these plugs make some slight improvements on some engines, like anything personal results are varied. i used them in my truck and they were awesome for about 15 to 20k mi, then i felt the performance was gone and i needed new plugs. i think if these were made with better quality then they would be a much better plug, just remember when the ngk v-power plugs came out they were deemed a "gimmick" plug and had reputation for not yielding as much performance as traditional plugs. for some reason no one wants plus to change, guess we need to use the same plug design that our great grandfathers used.