You are buying 2x BPR6ES-11 NGK SPARK PLUG FIT Hyundai Excel X2 1.5L G4DJ 4Cyl EFI, 62kW 90-94. The workhorse, at the heart of smooth-running engines around the world. Spark Plug. SPARK PLUGS. Spark plugs are the "window" into your engine (your only eyewitness to the combustion chamber), and can be used as a valuable diagnostic tool.