NGK G-Power Spark Plug vs NGK Laser Iridium IFR6T11 Spark Plug

The Laser Iridium IFR6T11 is the better plug for most drivers: its iridium fine-wire tip and platinum pad on the ground electrode last far longer than a single platinum tip, and it is the plug many engines were built around. The G-Power is a solid, cheaper-grade platinum plug that works well as a basic replacement on older engines that call for a platinum plug. Both are NGK, both use a 5/8-inch hex, but they are not interchangeable: the G-Power here is M12 with a 1.043-inch reach, the Laser Iridium is M14 with a 0.750-inch reach, so fit the plug your engine specifies.

• Choose the NGK G-Power if your engine calls for an M12 plug with a 1.043-inch reach and you want a dependable platinum replacement without stepping up to iridium.
• Choose the NGK Laser Iridium IFR6T11 if your engine specifies an M14 plug with 0.750-inch reach and a 0.044-inch gap, or came from the factory with iridium plugs.