{"product_id":"ignition-coil-iridium-spark-plugs-for-mercedes-benz-sl-class-2013-2017-4-7l-5-5l","title":"Ignition Coil + Iridium Spark Plugs for Mercedes Benz SL-Class (2013-2017) 4.7L 5.5L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eOEM-Spec Direct-Fit Ignition Coil \u0026amp; Iridium Spark Plug Kit for 2013-2017 Mercedes Benz SL-Class 4.7L, 5.5L (R231 M278 \/ M157)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The complete ignition kit replaces degraded factory coil-on-plug packs and spark plugs on the 2013-2017 Mercedes Benz SL-Class to eliminate high-load misfires, stabilize idle, and restore peak combustion efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Mercedes Benz SL-Class Ignition Breakdown Under Boost\u003c\/h3\u003e\n\u003cp\u003eTwin-turbocharged Mercedes-Benz direct-injected powerplants generate intense thermal loads inside the cylinder heads. Over time, the factory coil packs on the \u003cstrong\u003eM278\u003c\/strong\u003e 4.7L and \u003cstrong\u003eM157\u003c\/strong\u003e 5.5L suffer epoxy insulation breakdown and internal dielectric puncture due to continuous heat cycles. Concurrently, factory fine-wire electrodes suffer gap erosion from sustained high boost pressure. This combined degradation leads to spark blow-out at wide-open throttle, micro-arcing, intermittent P0300 through P0308 diagnostic trouble codes, and sluggish transient response under heavy load.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis ignition refresh kit pairs eight high-output coil-on-plug modules with factory-spec double-iridium spark plugs to restore factory secondary-circuit voltage. The ignition coils utilize high-grade magnetic silicon steel cores paired with vacuum-encapsulated copper windings to resist insulation failure up to elevated under-hood operating temperatures. The included \u003cstrong\u003eBosch ZR6SII3320\u003c\/strong\u003e double iridium plugs feature laser-welded fine-wire center electrodes and iridium-tipped ground electrodes, providing exceptional spark stability, reduced arc-voltage requirements, and resistance to direct-injection carbon fouling.\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: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\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;\"\u003e2013-2017 Mercedes Benz SL-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 (4.7L), M157 (5.5L) \/ R231\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;\"\u003e429-577 hp \/ 516-664 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;\"\u003eA2769063700, 2769063700, 2769060501, UF741, 0040103070, ZR6SII3320\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\u003e2013-2017 Mercedes Benz SL-Class SL550 4.7L V8 Biturbo (M278)\u003c\/li\u003e\n  \u003cli\u003e2013-2017 Mercedes Benz SL-Class SL63 AMG 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 R231 SL-Class?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2013-2017 Mercedes Benz SL-Class equipped with the M278 4.7L or M157 5.5L biturbo engines.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo the spark plugs require gapping prior to installation?\u003c\/strong\u003e\u003cbr\u003e No, these double iridium spark plugs arrive pre-gapped to factory specifications; do not mechanically gap fine-wire electrodes as ceramic or iridium alloy damage can occur.\u003c\/p\u003e\n\n\u003ch3\u003eThe Mercedes Benz Precision Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to meet stringent European direct-injection requirements, these components maintain precise primary and secondary resistance values to preserve ECU monitoring integrity and guarantee misfire-free operation without triggering false check engine lights.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50625864990968,"sku":"DS-E1MNPB1S9","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-sl-class-2013-2017-4-7l-5-5l-1.jpg?v=1790352563","url":"https:\/\/performancechiptuning.com\/products\/ignition-coil-iridium-spark-plugs-for-mercedes-benz-sl-class-2013-2017-4-7l-5-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}