Quote:
Originally Posted by MichaelInChicago
I just changed the stock plugs to NGK Iridiums in my wife's X1 and the difference is night and day.
I will be changing them in my GC this week.
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The only way there will be a noticeable difference is if the old plugs were out of range ( gap increased or plug failing). l had a noticeable difference in my 650 as well, but that was because the factory plugs were at the end of life and the gaps were all over the place.