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This is a (4 pack!)The NGK CR9EIX (stock no. 3521) Iridium IX spark plug is a high-performance plug designed for a variety of engines, particularly in powersports applications. It is compatible with many popular models from manufacturers such as:
Kawasaki: Various models including the Z series and ZX-6R.
Yamaha: Various YZF models.
Suzuki: GSX-R series.
Polaris: Ranger 900, RZR 570, and RZR 900 models.
Piaggio
It is also used in some specific car models, such as certain Mitsubishi Lancers