Specialized silicone magnetic steel cores are surrounded by precision wrapped windings using advanced bobbin technology which helps maintain the proper resistance and turn ratios necessary to deliver improved performance spark Molded using a high di-electric strength material. We then fill the housings with a specialized high temperature epoxy that not only increases the thermal conductivity but also helps resist shock, vibration and chemicals found in engines Direct Plug In Replacement results in a Direct OE Fit OBD ll Safe