NGK G-Power Spark Plug vs NGK Iridium IX Spark Plug

Both are NGK copper-core plugs with a single ground electrode, so the real split is tip material and service life. The G-Power's fine-wire platinum tip is the sensible pick for a stock daily driver that sees normal mileage and wants a long, stable service interval without fuss. The Iridium IX uses a smaller iridium tip and a taper-cut ground electrode, which resists fouling and spark erosion better under high heat and boost, and it is the plug enthusiasts and tuners reach for. Reviewers and owners on both sides praise NGK's consistency; the Iridium IX costs more to step up to, and the G-Power is the easier choice for a plain commuter.

• Choose the NGK G-Power if you drive a stock or lightly modified car and want a durable platinum plug with a long service life at the lower end of the NGK range.
• Choose the NGK Iridium IX if your engine runs hot, boosted or high-compression, or you want the fouling resistance and spark stability that tuners associate with a fine iridium tip.