You are buying 2x LFR5A-11 NGK SPARK PLUG FIT Nissan X-Trail T30 2.5L QR25DE MPFI,132KW,245Nm 01-06. 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.