{"product_id":"ignition-coil-and-iridium-spark-plugs-for-bmw-5-series-2001-2002-2-5l","title":"Ignition Coil and Iridium Spark Plugs for BMW 5 Series (2001-2002) 2.5L","description":"\u003ch2\u003eDirect-Fit Ignition Coil and Iridium Spark Plug Kit for 2001-2002 BMW 5 Series\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eComplete Ignition Refresh:\u003c\/strong\u003e Replaces degraded factory coil packs and worn spark plugs to eliminate misfires, stabilize idle RPM, and restore precise combustion timing on 2.5L inline-six engines.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock 5 Series Ignition Degradation\u003c\/h3\u003e\n\u003cp\u003eThe E39 engine bay generates significant thermal cycling that rapidly degrades factory coil potting material and internal copper windings. Over time, thermal fatigue causes dielectric breakdown, micro-fracturing of the silicone plug boots, and increased secondary winding resistance. Concurrently, factory spark plug electrodes erode, widening the spark gap and forcing the ignition coils to draw excessive primary amperage, which can overstress the DME output stages and cause partial-throttle hesitation, rough cold starts, and pending cylinder-specific misfire codes (P0300-P0306).\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive ignition service kit features six coil-on-plug assemblies engineered with high-purity copper windings, reinforced epoxy potting, and heat-resistant silicone boots to isolate spark voltage and resist thermal hardening. Paired with six fine-wire iridium spark plugs, this setup lowers ignition voltage demand while creating a concentrated, highly stable flame kernel. Direct-fit blade terminals and factory-matched electrical connectors ensure plug-and-play installation without requiring harness adaptation or resistance modifications.\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;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2001-2002 BMW 5 Series (525i)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eM54B25 \/ E39\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e184 hp \/ 175 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eUF354, UF-354, UF300, UF-300\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2001 BMW 525i Base Sedan\u003c\/strong\u003e — 2.5L L6 Gas (E39 \/ M54B25)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2001 BMW 525i Base Wagon (Touring)\u003c\/strong\u003e — 2.5L L6 Gas (E39 \/ M54B25)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2002 BMW 525i Base Sedan\u003c\/strong\u003e — 2.5L L6 Gas (E39 \/ M54B25)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2002 BMW 525i Base Wagon (Touring)\u003c\/strong\u003e — 2.5L L6 Gas (E39 \/ M54B25)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe BMW Precision Standard\u003c\/h3\u003e\n\u003cp\u003eCalibrated specifically to meet strict European engine management tolerances, ensuring full signal compatibility with Siemens MS43 engine control modules without triggering false ionization faults or check engine lights.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50458914095352,"sku":"DS-E69EUVQ3R","price":121.95,"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-5-series-2001-2002-2-5l-1.jpg?v=1788803368","url":"https:\/\/performancechiptuning.com\/products\/ignition-coil-and-iridium-spark-plugs-for-bmw-5-series-2001-2002-2-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}