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NGK Iridium Spark Plugs
It may be time to invest in precious metal futures. NGK Iridium Spark Plugs represent the ultimate evolution of spark plug technology and performance. Iridium allows for a center electrode 75 percent the size of a platinum electrode and 24 percent the size of a conventional nickel electrode.

The fine electrode tip is engineered for greater ignitability. And it's in the design of the iridium tip that makes Iridium IX a better spark plug. The electrode is not too thin and not too thick. It's just the right size to reduce the voltage required for spark and to maximize the overall longer life qualities of iridium.

NGK's new Iridium IX is the personification of these qualities and takes premium performance spark plugs to a new level. A level that is expected from the world leader in spark plugs.

At RPM Outlet, we have been running NGK plugs for nearly 15 years. We have tried all of the new plugs on the market including split fire, rapid fire, and the new, more expensive, Denzo Iridium Plugs. In each of these cases, we have not found any noticeable increases in 1/4-mile track times with these plugs. We have always came back to the NGK Spark Plugs because they seem to last the longest, and they are not as expensive as any of their competitors. We recommend using NGK Spark Plugs as opposed to generic spark plugs because of their superior quality, minimal expense, and long life.

NGK Iridium Spark Plugs Feature

More Durability and a Higher Melting Point Than Platinum
Better Center Electrode Anti-Oxidation and Anti-Erosion
Improved Ignition
Superior Anti-Fouling
Lower Required Voltage
New Metal Shell Plating Process for Better Anti-Corrosion

Part #	Type	Application	Price
NGKTR7IX	NGK V-Power *Iridium* Ford-GM Only	V-Power Spark Plug Supercharged Hi-Boost, N.O.S. applications Two heat ranges colder (iridium) Spark Plug	$ 7.49 (ea)
NGKBR7EFS	NGK NGK Tight-gap Copper Race Plug Ford-GM Only	NGK Tight-gap Copper Race Plug Supercharged Hi-Boost, N.O.S. applications Two heat ranges colder Race spark plug	$ 2.49 (ea)
NGKTR6	NGK V-Power Copper Race Plug Ford-GM Only	V-Power Spark Plug Supercharged Hi-Boost, N.O.S. applications Single heat range colder (copper) V-Power Spark Plug	$ 1.99 (ea)
NGKTR5	NGK V-Power Copper Ford-GM Only	V-Power Spark Plug High Performance V-Power Copper Plug Upgrade Standard heat range (copper) V-Power Spark Plug	$ 1.99 (ea)
ZEX-82070-8	ZEX Power Tune™ Plugs Ford-GM Only	ZEX Power Tune™ Plugs Designed for Bolt-on performance applications Single heat ranges colder spark plug	$ 49.95 (set of eight)
ZEX-82071-8	ZEX Power Racer™ Plugs Ford-GM Only	ZEX Power Racer™ Plugs Supercharged Hi-Boost, Turbos, N.O.S. applications Two heat ranges colder spark plugs	$ 49.95 (set of eight)
NGKLTZIX	NGK V-Power *Iridium* HEMI Only	DODGE HEMI Engine - High Performance V-Power Plug Improved Performance (iridium) Spark Plug Supercharged Hi-Boost, N.O.S. applications	$ 8.49 (ea)
NGK4306	NGK V-Power Copper HEMI Only	DODGE HEMI Engine - High Performance V-Power Plug Supercharged Hi-Boost, N.O.S. applications Single heat range colder (copper) V-Power Spark Plug	$ 2.49 (ea)
NGK5306	NGK V-Power Copper HEMI Only	DODGE HEMI Engine - High Performance V-Power Plug High Performance V-Power Copper Plug Upgrade Standard heat range (copper) V-Power Spark Plug	$ 2.49 (ea)

Why should you run a cold plug on supercharged and N.O.S. applications? What is a Cold plug? Click-here

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