NGK Iridium Spark Plugs LFR5AIX When tuning an engine or using it intensively you need Iridium spark plugs. These iridium spark plugs are designed to operate at higher temperatures than the OE ones and help dissipate heat inside the cylinders. This improves combustion and therefore performance whilst making for a more reliable engine by reducing the risk of detonation. Iridium spark plugs also offer a lifestan longer than OEM. Application List Non-exhaustive. BMW 1-Series E8X : 125i 130i (N52) BMW 3-Series E9X : 325i 330i (N52) BMW 5-Series E6X : 523i 525i (N52 N53) BMW 6-Series E6X : 630i (N52 N53) BMW 5-Series F07 F10 F11 : 523i 528i (N52 N53 N63) BMW X1 E84 : 2.5i 2.8i (N52) BMW X3 E83 : 2.5i 2.8i (N52) BMW X3 F25 : 2.8i (N52) BMW X5 E70 : 3.0i (N52) BMW Z4 E85 & E86 : 2.5i 3.0i (N52) Cadillac CTS V6 Daihatsu Sirion Honda Civic EP 1.3i & 1.4i Honda Insight 1.0i ECA1 Infiniti FX35 (VQ35DE) Infiniti FX45 (VK45DE) Kia Carnival II Kia Magentis II Kia Sorento II Lexus LS460 (1UZ-FE 3UZ-FE) Lexus RX350 Lotus Evora Mercedes Classe E S21 (03-09) E55 AMG Mercedes Classe E W21 (02-08) E55 AMG Mercedes Classe E C215 (99-06) CL55 AMG Mercedes CLS C21 (04-10) 55 AMG Mercedes SL R230 (01-12) 55 AMG Mitsubishi Colt Z30 Mitsubishi Eclipse 2.4 (4G69)/li> Mitsubishi Lancer Evolution (sauf Evo 10) (4G63 4G63T)/li> Mitsubishi Outlander CU Nissan 350Z 280 & 300 bhp (VQ35DE) Nissan Almera 1.8i Nissan Micra K12 Nissan Pathfinder R51M Nissan Primera 1.8i Nissan X-Trail Nissan SR20VE & SR20VET engines Opel Signum V6 Opel Vectra V6 Peugeot 206 S16 & RC Peugeot 307 1.6i 16V Peugeot 405 MI-16 (87-93) (XU9J4Z) Peugeot 407 V6 Porsche 997 after 2008 Porsche Boxster after 2009 Porsche Cayenne after 2010 Porsche Panamera Renault Clio V6 (L7X) Renault Espace IV V6 Renault Laguna V6 Renault Velsatis V6 Smart Forfour Brabus Subaru Forester after 2005 (EJ20 EJ22 EJ25) Subaru Impreza after 2005 (EJ20 EJ22 EJ25) Subaru Legacy after 2005 (EJ20 EJ22 EJ25) Suzuki Swift Sport ZC32 (M16A)