<h2>Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2003-2015 BMW 3 Series</h2> <p><strong>What it Does:</strong> Replaces degraded factory ignition coils and worn plugs to eliminate cylinder misfires, restore lost combustion efficiency, and stabilize idle across all six cylinders.</p> <h3>The Stock 3 Series Ignition Coil Thermal Breakdown</h3> <p>The inline-six engines in the BMW 3 Series position ignition coils deep within tight cylinder head spark plug wells, directly exposed to severe thermal cycling and engine heat soak. Over time, OEM primary and secondary epoxy insulation breaks down, causing internal dielectric breakdown, micro-arcing, and high-rpm spark blowout under load. This degradation leads to intermittent rough idling, DME fault codes (29DC, 29CD, 29CF), and power loss under hard acceleration.</p> <h3>The Engineering Solution</h3> <p>This 6-cylinder ignition kit integrates high-density copper primary and secondary windings encased in reinforced, heat-resistant thermoplastic housings designed to withstand elevated underhood operating temperatures. Direct-fit electrical connectors with blade terminals ensure a secure, corrosion-resistant electrical connection. Paired with fine-wire iridium spark plugs, the assembly delivers consistent, high-energy spark discharge, rapid flame propagation, and improved resistance to fouling.</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;">2003-2015 BMW 3 Series (3.0L Inline-6)</td> </tr> <tr> <td style="padding:8px;"><strong>Engine / Chassis</strong></td> <td style="padding:8px;">N52, N54, N55, M54 / E46, E90, E92, E93, F30</td> </tr> <tr style="background-color: #f9f9f9;"> <td style="padding:8px;"><strong>Stock Output</strong></td> <td style="padding:8px;">230–300 hp / 200–300 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>2003-2006 BMW 330i, 330Ci, 330xi 3.0L L6</li> <li>2006 BMW 325i, 325xi, 330i, 330xi 3.0L L6</li> <li>2007-2013 BMW 328i, 328xi, 328i xDrive 3.0L L6</li> <li>2007-2015 BMW 335i, 335is, 335xi, 335i xDrive 3.0L L6 Turbo</li> </ul> <h3>The BMW Precision Standard</h3> <p>Engineered to meet tight German DME diagnostic tolerances, this ignition pack delivers precise dwell times and accurate secondary voltage without triggering phantom misfire codes or check engine lights.</p>