Review on NGK CR9EHIX 9 Iridium Spark Plug by Terry Owens
Overpromised, Underdelivered Spark Plug
As a result of my tests i determined that this spark plug did not improve the PERFORMANCE of my automotive ignition.The promised increased fuel efficiency was nowhere to be seen..
Pros
- Easy to install.
Cons
- Did not deliver on promised fuel efficiency improvement.
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