{"product_id":"ignition-coil-and-iridium-spark-plugs-for-bmw-m5-1999-2003-4-9l","title":"Ignition Coil and Iridium Spark Plugs for BMW M5 (1999-2003) 4.9L","description":"\u003ch2\u003eDirect-Fit Ignition Coil and Iridium Spark Plug Service Kit for 1999-2003 BMW M5\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Ignition Coil and Iridium Spark Plug Kit replaces degraded factory secondary ignition components on the 1999-2003 BMW M5 to restore combustion efficiency, eliminate high-RPM misfires, and stabilize idle quality.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock BMW M5 Thermal Degradation Weakness\u003c\/h3\u003e\n\u003cp\u003eThe naturally aspirated 4.9-liter \u003cstrong\u003eS62\u003c\/strong\u003e engine packages eight individual ignition coils beneath tightly sealed aesthetic engine covers, isolating them within a severe thermal environment. Over sustained heat cycles, the factory epoxy resin casings develop microscopic dielectric breakdown pathways, causing high-voltage spark arcing directly to the cylinder head rather than across the plug gap. Simultaneously, aged original equipment plugs suffer from center electrode erosion, widening the spark gap under cylinder pressure. This combination increases primary electrical resistance, overburdens the internal driver stages of the Siemens MSS52 DME, and results in rough idling, limp-mode triggers, and distinct top-end power hesitation above 5,500 RPM.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis complete ignition overhaul kit pairs eight reinforced pencil coils with eight high-durability iridium spark plugs to re-establish factory-spec spark discharge energy. Each coil features upgraded copper secondary windings insulated with high-grade, heat-resistant silicone boots that resist dielectric puncture and oil vapor contamination in the spark plug wells. The paired fine-wire iridium core plugs provide a stable, concentrated flame kernel with substantially reduced firing voltage requirements compared to conventional nickel or platinum cores. By maintaining an accurate spark gap under high cylinder pressures and 7,000 RPM loads, this direct-replacement kit restores original throttle response, stabilizes closed-loop fuel trims, and prevents ignition-induced catalyst degradation.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e1999-2003 BMW M5 Base Sedan 4-Door\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e\n\u003cstrong\u003eS62B50\u003c\/strong\u003e (4.9L V8) \/ \u003cstrong\u003eE39\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e394 hp \/ 369 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e\n\u003cstrong\u003e12131748017\u003c\/strong\u003e, \u003cstrong\u003e12131748018\u003c\/strong\u003e, UF300, 5C1050, CUF354, C672, CUF300, GN10016\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1999 BMW M5 Base Sedan 4.9L V8 (S62)\u003c\/li\u003e\n  \u003cli\u003e2000 BMW M5 Base Sedan 4.9L V8 (S62)\u003c\/li\u003e\n  \u003cli\u003e2001 BMW M5 Base Sedan 4.9L V8 (S62)\u003c\/li\u003e\n  \u003cli\u003e2002 BMW M5 Base Sedan 4.9L V8 (S62)\u003c\/li\u003e\n  \u003cli\u003e2003 BMW M5 Base Sedan 4.9L V8 (S62)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the E39 M5?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 1999-2003 BMW M5 equipped with the S62 engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these spark plugs pre-gapped for the S62 engine?\u003c\/strong\u003e\u003cbr\u003e Yes, the iridium plugs are pre-set to factory clearance specs, eliminating the need for adjustment prior to installation.\u003c\/p\u003e\n\n\u003ch3\u003eThe BMW Precision Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered strictly to match original European electrical impedance profiles, this ignition kit maintains flawless DME communication without triggering check engine lights or misfire codes. Maintain your factory sports sedan caliber with parts built to deliver clean, uninterrupted ignition throughout the entire S62 rev range.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50606470103288,"sku":"DS-EVJ84IU4Z","price":134.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-and-iridium-spark-plugs-for-bmw-m5-1999-2003-4-9l-1.jpg?v=1790090504","url":"https:\/\/performancechiptuning.com\/fr\/products\/ignition-coil-and-iridium-spark-plugs-for-bmw-m5-1999-2003-4-9l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}