<h2>Direct-Fit Ignition Coil and Iridium Spark Plug Service Kit for 2012-2018 BMW 6 Series</h2> <p><strong>Primary Function:</strong> Replaces degraded factory ignition coils and worn plugs to eliminate misfires, stabilize idle fluctuations, and restore clean combustion under boost.</p> <h3>The Stock 6 Series Ignition Breakdown</h3> <p>The turbocharged 3.0L N55 inline-six engine subjects ignition hardware to intense cylinder head heat and high combustion chamber pressures. Over time, factory coil housings suffer dielectric breakdown and micro-cracking along the boots, leading to secondary voltage leakage and rough idling. Concurrently, factory plug electrodes erode, widening the gap and overworking the coils, which frequently causes ignition hesitation, DME misfire fault codes, and sluggish throttle response under load.</p> <h3>The Engineering Solution</h3> <p>This direct-replacement kit resolves ignition voltage drops by utilizing premium primary and secondary copper windings wrapped in heat-resistant epoxy housings. These direct-fit coil assemblies deliver stable high-voltage output across all engine speeds. Paired with fine-wire iridium spark plugs that resist electrode erosion and fouling, this kit maintains optimal spark gap integrity, ensures crisp throttle response, and prevents spark blowout under peak boost.</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;">2012-2018 BMW 6 Series (640i / 640i xDrive)</td> </tr> <tr> <td style="padding:8px;"><strong>Engine / Chassis</strong></td> <td style="padding:8px;">3.0L Turbo I6 (N55B30) / F06, F12, F13</td> </tr> <tr style="background-color: #f9f9f9;"> <td style="padding:8px;"><strong>Stock Output</strong></td> <td style="padding:8px;">315 hp / 330 lb-ft (Approx)</td> </tr> <tr> <td style="padding:8px;"><strong>Part Number</strong></td> <td style="padding:8px;">UF515, UF-515, UF522, UF-522</td> </tr> </table> <h3>Compatibility</h3> <ul> <li>2012-2018 BMW 640i Base Coupe / Convertible 3.0L L6 (F12 / F13)</li> <li>2013-2018 BMW 640i Gran Coupe 3.0L L6 (F06)</li> <li>2014-2018 BMW 640i xDrive Coupe / Convertible 3.0L L6 (F12 / F13)</li> <li>2014-2018 BMW 640i xDrive Gran Coupe 3.0L L6 (F06)</li> </ul> <h3>The BMW Precision Standard</h3> <p>Calibrated specifically for European engine management protocols, these components match factory dwell times and resistance parameters to ensure seamless DME integration and zero check-engine light triggers.</p>