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What do the plugs look like when you take them out, are they black as hell, or white? Does the three in that bosch number mean heat range, if so I would think that it is way to hot of a plug as mfi likes to run fat.
I could never get the ngk's to work in my car no matter what heat range I used, so I went to the tried and true 4 electrode bosch which work awesome for my car.
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72 911
Although it is done at the moment, it will never be finished.
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