{"product_id":"ignition-coil-iridium-spark-plugs-for-mercedes-benz-cls-class-2012-2016-4-7l-5-5l","title":"Ignition Coil + Iridium Spark Plugs for Mercedes Benz CLS-Class (2012-2016) 4.7L 5.5L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Ignition Coil and Iridium Spark Plug Kit for 2012-2016 Mercedes Benz CLS-Class 4.7L, 5.5L (C218 \/ M278, M157)\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 ignition components on the 2012-2016 Mercedes Benz CLS-Class to eliminate high-boost misfires and restore precise combustion timing.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Mercedes Benz CLS-Class Secondary Breakdown Vulnerability\u003c\/h3\u003e\n\u003cp\u003eThe twin-turbocharged \u003cstrong\u003eM278\u003c\/strong\u003e and \u003cstrong\u003eM157\u003c\/strong\u003e direct-injected engines in the \u003cstrong\u003eC218\u003c\/strong\u003e chassis generate extreme thermal loads inside the compact cylinder head valley. Over time, heat soak compromises the factory coil windings, degrading the internal copper windings and insulation boots. Concurrently, high cylinder pressures accelerate electrode erosion on standard plugs, expanding the spark gap. This dielectric stress induces spark blowout, high-rpm misfire codes, rough idle, and DME torque limiting under peak boost.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive service kit features eight heavy-duty coil packs and fine-wire double-iridium spark plugs engineered to withstand severe turbo duty cycles. The direct-fit ignition coils utilize high-dielectric epoxy potting and reinforced silicone boots to resist thermal degradation and current leakage. Matched with laser-welded iridium electrode spark plugs (OEM cross \u003cstrong\u003eZR6SII3320\u003c\/strong\u003e), this assembly maintains consistent spark energy under high cylinder pressure while resisting fouling and gap erosion.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n  \u003ctable width=\"100 style=\" border-collapse: collapse border: solid font-size: min-width:\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;\"\u003e2012-2016 Mercedes Benz CLS-Class\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;\"\u003eM278, M157 BiTurbo \/ C218\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;\"\u003e402 - 577 hp \/ 443 - 590 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;\"\u003eUF741, A2769063700, 2769063700, 2769060501, 0040103070\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2012-2016 Mercedes Benz CLS-Class CLS550 4.7L V8 Biturbo (M278)\u003c\/li\u003e\n  \u003cli\u003e2012-2014 Mercedes Benz CLS-Class CLS63 AMG 5.5L V8 Biturbo (M157)\u003c\/li\u003e\n  \u003cli\u003e2014-2016 Mercedes Benz CLS-Class CLS63 AMG S 5.5L V8 Biturbo (M157)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the C218 CLS-Class?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2012-2016 Mercedes Benz CLS-Class equipped with the M278 and M157 engine platforms.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo these spark plugs require manual gapping before installation?\u003c\/strong\u003e\u003cbr\u003e No, these double-iridium plugs are factory pre-gapped for direct application; altering the delicate fine-wire center electrode risks damage.\u003c\/p\u003e\n\n\u003ch3\u003eThe Mercedes Benz Precision Standard\u003c\/h3\u003e\n\u003cp\u003eDirect-injection biturbo Mercedes-Benz engines demand exact electrical resistance tolerances to avoid triggering sensitive knock and misfire logic. This kit guarantees clean combustion delivery, restoring factory torque parameters and emissions compliance without throwing diagnostic trouble codes.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50625855357176,"sku":"DS-E0YK4Q6LA","price":499.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-iridium-spark-plugs-for-mercedes-benz-cls-class-2012-2016-4-7l-5-5l-1.jpg?v=1790352363","url":"https:\/\/performancechiptuning.com\/fr\/products\/ignition-coil-iridium-spark-plugs-for-mercedes-benz-cls-class-2012-2016-4-7l-5-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}