<h2>Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2013-2016 BMW X3</h2> <p><strong>Primary Function:</strong> Restores complete combustion efficiency and eliminates cylinder misfires on the turbocharged 3.0L inline-six engine by replacing worn secondary ignition components.</p> <h3>The Stock F25 Thermal Degradation Weakness</h3> <p>The BMW N55 engine operates under high thermal loads and elevated cylinder pressures due to forced induction. Over time, the factory coil-on-plug boots suffer from dielectric breakdown, thermal cycling fatigue, and internal resistance drift. This causes micro-arcing, intermittent under-load misfires (DTC 2EFE/2EFF series), rough idle speeds, and unburnt fuel entering the catalytic converter.</p> <h3>The Precision Engineering Solution</h3> <p>This comprehensive service kit includes six high-dielectric coil packs and matched fine-wire iridium spark plugs. The ignition coils feature premium-grade internal copper windings and reinforced thermoplastic housings to resist engine bay heat soak. Matched with high-durability iridium electrodes that maintain a precise gap under peak boost, this setup is designed to ensure stable spark energy, crisp throttle response, and complete flame propagation across all six cylinders.</p> <h3>Technical Specifications</h3> <table width="100%" style="border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;"> <tr style="background-color: #f9f9f9;"> <td style="padding:8px;"><strong>Fitment</strong></td> <td style="padding:8px;">2013-2016 BMW X3</td> </tr> <tr> <td style="padding:8px;"><strong>Engine / Chassis</strong></td> <td style="padding:8px;">3.0L N55 Turbocharged I6 / F25</td> </tr> <tr style="background-color: #f9f9f9;"> <td style="padding:8px;"><strong>Stock Output</strong></td> <td style="padding:8px;">300 hp / 300 lb-ft (Approx)</td> </tr> <tr> <td style="padding:8px;"><strong>Part Number / Interchange</strong></td> <td style="padding:8px;">UF515, UF-515, UF522, UF-522</td> </tr> </table> <h3>Compatibility</h3> <ul> <li>2013 BMW X3 xDrive35i 3.0L L6 (F25 / N55 Engine)</li> <li>2014 BMW X3 xDrive35i 3.0L L6 (F25 / N55 Engine)</li> <li>2015 BMW X3 xDrive35i 3.0L L6 (F25 / N55 Engine)</li> <li>2016 BMW X3 xDrive35i 3.0L L6 (F25 / N55 Engine)</li> </ul> <h3>The BMW Precision Standard</h3> <p>Engineered to meet strict European OBD-II parameters, this direct-replacement assembly prevents hesitation, maintains flawless factory idle stability, and ensures zero Check Engine Light (CEL) triggers under high-boost conditions.</p>