Review on ๐ฅ NGK 7397 TR5IX Iridium IX Spark Plug, Set of 4 - Improve Engine Performance and Efficiency! by Evan Roberts
Works really well, best in spark plugs
Installed 7397 NKG spark plugs and a new Edelebrock 22716 Ultra Spark 50 wire kit on a 2001 Chevy Suburban with 270,000 miles on the odometer and what an improvement ! The engine is significantly more powerful and idles like a kitten and no longer downshifts unnecessarily on the route. After that I also installed new ignition coils for MSD 55098 street fires and noticed an even stronger response. When replacing, pull off the valve covers with coils and install new valve cover gaskets. Do not use lubricants on these spark plugs according to the manufacturer's instructions.
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