NGK IRIDIUM MAX BKR7EIX-11PS [Set of 4] [STOCK NO.] 1175 Spark Plug7 Inheriting the potential of IX and further maintaining high performance! The ultimate long life that challenges maintenance free! [NO. 1] Increased plug life: Ultimate long life with the same performance as Iridium IX! ! Also contributes to reducing maintenance! ! Even if you are not good at mechanics, you can easily experience the performance of Iridium. [NO. 2] Increased fuel efficiency: Outstanding fuel efficiency. Kind to your wallet and the