Review on π₯ NGK 7397 TR5IX Iridium IX Spark Plug, Set of 4 - Improve Engine Performance and Efficiency! by John Patterson
More power!: Ignition Parts
I was very impressed with these candles. I used these along with a set of Taylor connector cables on my 2009 GMC Denali. The truck felt a bit sluggish and I decided to change the ac telco Iridium plugs which have done about 50,000 miles. The difference between day and night. The whole work took about an hour. Each fork was easily accessible and interchangeable. I'll update the post with my fuel economy findings.
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