Porsche Panamera 4.8L Iridium Spark Plug 99917013090 FGR5NQE04

Porsche Panamera 4.8L models (2000-2010) dedicated spark plug, OEM number: 99917013090, model FGR5NQ04, with double iridium electrode. Compared to nickel alloy plugs, has about 3x better anti-erosion life; thread and insulator process tightly controlled; durability close to factory. Core function is precise ignition of the air-fuel mixture; iridium electrode maintains a more stable ignition gap, reducing misfire rates and improving low-end torque and idle smoothness. Installation difficulty: medium; requires removing intake manifold and ignition coils. Tighten to 25-30 Nm with a torque wrench to avoid over-tightening damage.